Revert "Teach EMailExtensionRegistry to find extensions."

This reverts commit bf30024dd7973006bf99d0ae509a7f0022368a41, because
it breaks EMailFormatter/Parser extensions, like the prefer-plain.
The thing is that the internal formatters/parsers (also extensions)
should be always added first, and only after then can be added extended
extensions, which are used before those internal. This constraint was not
satisfied with the reverted commit, the order of extension registration
was unpredictable, depended on GType.

60 files changed, 752 insertions, 201 deletions

diff --git a/em-format/Makefile.am b/em-format/Makefile.am
index f26a004d0a..51c7471cc9 100644
--- a/em-format/Makefile.am
+++ b/em-format/Makefile.am
@@ -40,6 +40,8 @@ libemformat_la_SOURCES =				\
 	$(emformatinclude_HEADERS)			\
 	e-mail-extension-registry.c			\
 	e-mail-inline-filter.c				\
+	e-mail-format-extensions.c			\
+	e-mail-format-extensions.h			\
 	e-mail-formatter.c				\
 	e-mail-formatter-print.c			\
 	e-mail-formatter-quote.c			\
diff --git a/em-format/e-mail-extension-registry.c b/em-format/e-mail-extension-registry.c
index 7e5f3a9b0b..158951f813 100644
--- a/em-format/e-mail-extension-registry.c
+++ b/em-format/e-mail-extension-registry.c
@@ -22,6 +22,7 @@
 
 #include <libebackend/libebackend.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-parser-extension.h"
 
@@ -57,49 +58,6 @@ destroy_queue (GQueue *queue)
 }
 
 static void
-mail_extension_registry_add_extension (EMailExtensionRegistry *registry,
-                                       const gchar **mime_types,
-                                       GType extension_type)
-{
-	GObject *extension;
-	gint ii;
-
-	if (mime_types == NULL) {
-		g_critical (
-			"%s does not define any MIME types",
-			g_type_name (extension_type));
-		return;
-	}
-
-	extension = g_object_new (extension_type, NULL);
-
-	for (ii = 0; mime_types[ii] != NULL; ii++) {
-		GQueue *queue;
-
-		queue = g_hash_table_lookup (
-			registry->priv->table, mime_types[ii]);
-		if (queue == NULL) {
-			queue = g_queue_new ();
-			g_hash_table_insert (
-				registry->priv->table,
-				(gpointer) mime_types[ii],
-				queue);
-		}
-
-		g_queue_push_head (queue, g_object_ref (extension));
-
-		if (camel_debug ("emformat:registry")) {
-			printf (
-				"Added extension '%s' for type '%s'\n",
-				g_type_name (extension_type),
-				mime_types[ii]);
-		}
-	}
-
-	g_object_unref (extension);
-}
-
-static void
 mail_extension_registry_finalize (GObject *object)
 {
 	EMailExtensionRegistryPrivate *priv;
@@ -138,6 +96,55 @@ e_mail_extension_registry_init (EMailExtensionRegistry *registry)
 }
 
 /**
+ * e_mail_extension_registry_add_extension:
+ * @registry: an #EMailExtensionRegistry
+ * @mime_types: a %NULL-terminated array of MIME types
+ * @extension_type: the #GType of the extension being added
+ *
+ * Creates an instance of @extension_type and registers the instance for
+ * all provided MIME types.
+ */
+void
+e_mail_extension_registry_add_extension (EMailExtensionRegistry *registry,
+                                         const gchar **mime_types,
+                                         GType extension_type)
+{
+	GObject *extension;
+	gint ii;
+
+	g_return_if_fail (E_IS_MAIL_EXTENSION_REGISTRY (registry));
+	g_return_if_fail (mime_types != NULL);
+	g_return_if_fail (extension_type != G_TYPE_INVALID);
+
+	extension = g_object_new (extension_type, NULL);
+
+	for (ii = 0; mime_types[ii] != NULL; ii++) {
+		GQueue *queue;
+
+		queue = g_hash_table_lookup (
+			registry->priv->table, mime_types[ii]);
+		if (queue == NULL) {
+			queue = g_queue_new ();
+			g_hash_table_insert (
+				registry->priv->table,
+				(gpointer) mime_types[ii],
+				queue);
+		}
+
+		g_queue_push_head (queue, g_object_ref (extension));
+
+		if (camel_debug ("emformat:registry")) {
+			printf (
+				"Added extension '%s' for type '%s'\n",
+				g_type_name (extension_type),
+				mime_types[ii]);
+		}
+	}
+
+	g_object_unref (extension);
+}
+
+/**
  * e_mail_extension_registry_get_for_mime_type:
  * @regstry: An #EMailExtensionRegistry
  * @mime_type: A string with mime-type to look up
@@ -217,36 +224,6 @@ e_mail_parser_extension_registry_init (EMailParserExtensionRegistry *registry)
 {
 }
 
-void
-e_mail_parser_extension_registry_load (EMailParserExtensionRegistry *registry)
-{
-	GType *children;
-	GType base_extension_type;
-	guint ii, n_children;
-
-	g_return_if_fail (E_IS_MAIL_PARSER_EXTENSION_REGISTRY (registry));
-
-	base_extension_type = E_TYPE_MAIL_PARSER_EXTENSION;
-	children = g_type_children (base_extension_type, &n_children);
-
-	for (ii = 0; ii < n_children; ii++) {
-		EMailParserExtensionClass *class;
-
-		if (G_TYPE_IS_ABSTRACT (children[ii]))
-			continue;
-
-		class = g_type_class_ref (children[ii]);
-
-		mail_extension_registry_add_extension (
-			E_MAIL_EXTENSION_REGISTRY (registry),
-			class->mime_types, children[ii]);
-
-		g_type_class_unref (class);
-	}
-
-	g_free (children);
-}
-
 /******************************************************************************/
 
 G_DEFINE_TYPE_WITH_CODE (
@@ -265,32 +242,3 @@ e_mail_formatter_extension_registry_init (EMailFormatterExtensionRegistry *regis
 {
 }
 
-void
-e_mail_formatter_extension_registry_load (EMailFormatterExtensionRegistry *registry,
-                                          GType base_extension_type)
-{
-	GType *children;
-	guint ii, n_children;
-
-	g_return_if_fail (E_IS_MAIL_FORMATTER_EXTENSION_REGISTRY (registry));
-
-	children = g_type_children (base_extension_type, &n_children);
-
-	for (ii = 0; ii < n_children; ii++) {
-		EMailFormatterExtensionClass *class;
-
-		if (G_TYPE_IS_ABSTRACT (children[ii]))
-			continue;
-
-		class = g_type_class_ref (children[ii]);
-
-		mail_extension_registry_add_extension (
-			E_MAIL_EXTENSION_REGISTRY (registry),
-			class->mime_types, children[ii]);
-
-		g_type_class_unref (class);
-	}
-
-	g_free (children);
-}
-
diff --git a/em-format/e-mail-extension-registry.h b/em-format/e-mail-extension-registry.h
index 7002eb0385..21011ef286 100644
--- a/em-format/e-mail-extension-registry.h
+++ b/em-format/e-mail-extension-registry.h
@@ -57,6 +57,10 @@ struct _EMailExtensionRegistryClass {
 
 GType		e_mail_extension_registry_get_type
 					(void) G_GNUC_CONST;
+void		e_mail_extension_registry_add_extension
+					(EMailExtensionRegistry *registry,
+					 const gchar **mime_types,
+					 GType extension_type);
 GQueue *	e_mail_extension_registry_get_for_mime_type
 					(EMailExtensionRegistry *registry,
 					 const gchar *mime_type);
@@ -104,8 +108,6 @@ struct _EMailParserExtensionRegistryClass {
 
 GType		e_mail_parser_extension_registry_get_type
 					(void) G_GNUC_CONST;
-void		e_mail_parser_extension_registry_load
-					(EMailParserExtensionRegistry *registry);
 
 G_END_DECLS
 
@@ -147,9 +149,6 @@ struct _EMailFormatterExtensionRegistryClass {
 
 GType		e_mail_formatter_extension_registry_get_type
 					(void) G_GNUC_CONST;
-void		e_mail_formatter_extension_registry_load
-					(EMailFormatterExtensionRegistry *registry,
-					 GType base_extension_type);
 
 G_END_DECLS
 
diff --git a/em-format/e-mail-format-extensions.c b/em-format/e-mail-format-extensions.c
new file mode 100644
index 0000000000..8ba36702a8
--- /dev/null
+++ b/em-format/e-mail-format-extensions.c
@@ -0,0 +1,144 @@
+/*
+ * e-mail-format-extensions.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the program; if not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+#include "e-mail-format-extensions.h"
+
+#include "em-format/e-mail-parser-extension.h"
+#include "em-format/e-mail-formatter-extension.h"
+
+typedef GType (*TypeFunc) (void);
+
+TypeFunc parser_funcs[] = {
+	e_mail_parser_application_mbox_get_type,
+	e_mail_parser_attachment_bar_get_type,
+	e_mail_parser_headers_get_type,
+	e_mail_parser_message_get_type,
+	e_mail_parser_secure_button_get_type,
+	e_mail_parser_source_get_type,
+	e_mail_parser_image_get_type,
+	e_mail_parser_inline_pgp_encrypted_get_type,
+	e_mail_parser_inline_pgp_signed_get_type,
+	e_mail_parser_message_delivery_status_get_type,
+	e_mail_parser_message_external_get_type,
+	e_mail_parser_message_rfc822_get_type,
+	e_mail_parser_multipart_alternative_get_type,
+	e_mail_parser_multipart_apple_double_get_type,
+	e_mail_parser_multipart_digest_get_type,
+	e_mail_parser_multipart_encrypted_get_type,
+	e_mail_parser_multipart_mixed_get_type,
+	e_mail_parser_multipart_related_get_type,
+	e_mail_parser_multipart_signed_get_type,
+	e_mail_parser_text_enriched_get_type,
+	e_mail_parser_text_html_get_type,
+	e_mail_parser_text_plain_get_type,
+#ifdef ENABLE_SMIME
+	e_mail_parser_application_smime_get_type,
+#endif
+	NULL
+};
+
+TypeFunc formatter_funcs[] = {
+	e_mail_formatter_attachment_get_type,
+	e_mail_formatter_attachment_bar_get_type,
+	e_mail_formatter_error_get_type,
+	e_mail_formatter_headers_get_type,
+	e_mail_formatter_secure_button_get_type,
+	e_mail_formatter_source_get_type,
+	e_mail_formatter_image_get_type,
+	e_mail_formatter_message_rfc822_get_type,
+	e_mail_formatter_text_enriched_get_type,
+	e_mail_formatter_text_html_get_type,
+	e_mail_formatter_text_plain_get_type,
+	NULL
+};
+
+TypeFunc quote_formatter_funcs[] = {
+	e_mail_formatter_quote_attachment_get_type,
+	e_mail_formatter_quote_headers_get_type,
+	e_mail_formatter_quote_message_rfc822_get_type,
+	e_mail_formatter_quote_text_enriched_get_type,
+	e_mail_formatter_quote_text_html_get_type,
+	e_mail_formatter_quote_text_plain_get_type,
+	NULL
+};
+
+TypeFunc print_formatter_funcs[] = {
+	e_mail_formatter_print_headers_get_type,
+	NULL
+};
+
+static void
+load (EMailExtensionRegistry *ereg,
+      TypeFunc *func_array)
+{
+	gint ii;
+
+	for (ii = 0; func_array[ii] != NULL; ii++) {
+		GType extension_type;
+		GType interface_type;
+		gpointer extension_class;
+		const gchar **mime_types = NULL;
+
+		extension_type = func_array[ii]();
+		extension_class = g_type_class_ref (extension_type);
+
+		interface_type = E_TYPE_MAIL_FORMATTER_EXTENSION;
+		if (g_type_is_a (extension_type, interface_type))
+			mime_types = ((EMailFormatterExtensionClass *)
+				extension_class)->mime_types;
+
+		interface_type = E_TYPE_MAIL_PARSER_EXTENSION;
+		if (g_type_is_a (extension_type, interface_type))
+			mime_types = ((EMailParserExtensionClass *)
+				extension_class)->mime_types;
+
+		if (mime_types != NULL)
+			e_mail_extension_registry_add_extension (
+				ereg, mime_types, extension_type);
+		else
+			g_critical (
+				"%s does not define any MIME types",
+				g_type_name (extension_type));
+
+		g_type_class_unref (extension_class);
+	}
+}
+
+void
+e_mail_parser_internal_extensions_load (EMailExtensionRegistry *ereg)
+{
+	load (ereg, parser_funcs);
+}
+
+void
+e_mail_formatter_internal_extensions_load (EMailExtensionRegistry *ereg)
+{
+	load (ereg, formatter_funcs);
+}
+
+void
+e_mail_formatter_quote_internal_extensions_load (EMailExtensionRegistry *ereg)
+{
+	load (ereg, quote_formatter_funcs);
+}
+
+void
+e_mail_formatter_print_internal_extensions_load (EMailExtensionRegistry *ereg)
+{
+	load (ereg, print_formatter_funcs);
+}
diff --git a/em-format/e-mail-format-extensions.h b/em-format/e-mail-format-extensions.h
new file mode 100644
index 0000000000..1756ee2411
--- /dev/null
+++ b/em-format/e-mail-format-extensions.h
@@ -0,0 +1,88 @@
+/*
+ * e-mail-format-extensions.h
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) version 3.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with the program; if not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+#ifndef E_MAIL_FORMAT_EXTENSIONS_H
+#define E_MAIL_FORMAT_EXTENSIONS_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <em-format/e-mail-extension-registry.h>
+#include <em-format/e-mail-part.h>
+#include <e-util/e-util.h>
+
+G_BEGIN_DECLS
+
+void	e_mail_formatter_internal_extensions_load	(EMailExtensionRegistry *ereg);
+void	e_mail_parser_internal_extensions_load		(EMailExtensionRegistry *ereg);
+void	e_mail_formatter_quote_internal_extensions_load	(EMailExtensionRegistry *ereg);
+void	e_mail_formatter_print_internal_extensions_load	(EMailExtensionRegistry *ereg);
+
+GType	e_mail_formatter_attachment_get_type		(void);
+GType	e_mail_formatter_attachment_bar_get_type
+							(void);
+GType	e_mail_formatter_error_get_type			(void);
+GType	e_mail_formatter_headers_get_type		(void);
+GType	e_mail_formatter_secure_button_get_type
+							(void);
+GType	e_mail_formatter_source_get_type		(void);
+GType	e_mail_formatter_image_get_type			(void);
+GType	e_mail_formatter_message_rfc822_get_type	(void);
+GType	e_mail_formatter_text_enriched_get_type		(void);
+GType	e_mail_formatter_text_html_get_type		(void);
+GType	e_mail_formatter_text_plain_get_type		(void);
+
+GType	e_mail_parser_application_mbox_get_type		(void);
+GType	e_mail_parser_attachment_bar_get_type		(void);
+GType	e_mail_parser_headers_get_type			(void);
+GType	e_mail_parser_message_get_type			(void);
+GType	e_mail_parser_secure_button_get_type		(void);
+GType	e_mail_parser_source_get_type			(void);
+GType	e_mail_parser_image_get_type			(void);
+GType	e_mail_parser_inline_pgp_encrypted_get_type	(void);
+GType	e_mail_parser_inline_pgp_signed_get_type	(void);
+GType	e_mail_parser_message_delivery_status_get_type	(void);
+GType	e_mail_parser_message_external_get_type		(void);
+GType	e_mail_parser_message_rfc822_get_type		(void);
+GType	e_mail_parser_multipart_alternative_get_type	(void);
+GType	e_mail_parser_multipart_apple_double_get_type	(void);
+GType	e_mail_parser_multipart_digest_get_type		(void);
+GType	e_mail_parser_multipart_encrypted_get_type	(void);
+GType	e_mail_parser_multipart_mixed_get_type		(void);
+GType	e_mail_parser_multipart_related_get_type	(void);
+GType	e_mail_parser_multipart_signed_get_type		(void);
+GType	e_mail_parser_text_enriched_get_type		(void);
+GType	e_mail_parser_text_html_get_type		(void);
+GType	e_mail_parser_text_plain_get_type		(void);
+#ifdef ENABLE_SMIME
+GType	e_mail_parser_application_smime_get_type	(void);
+#endif
+
+GType	e_mail_formatter_quote_attachment_get_type	(void);
+GType	e_mail_formatter_quote_headers_get_type		(void);
+GType	e_mail_formatter_quote_message_rfc822_get_type	(void);
+GType	e_mail_formatter_quote_text_enriched_get_type	(void);
+GType	e_mail_formatter_quote_text_html_get_type	(void);
+GType	e_mail_formatter_quote_text_plain_get_type	(void);
+
+GType	e_mail_formatter_print_headers_get_type		(void);
+
+G_END_DECLS
+
+#endif /* E_MAIL_FORMAT_EXTENSIONS_H */
diff --git a/em-format/e-mail-formatter-attachment-bar.c b/em-format/e-mail-formatter-attachment-bar.c
index 4591501331..5633f4fb33 100644
--- a/em-format/e-mail-formatter-attachment-bar.c
+++ b/em-format/e-mail-formatter-attachment-bar.c
@@ -20,17 +20,15 @@
 #include <config.h>
 #endif
 
-#include "e-mail-part-attachment-bar.h"
-
 #include <glib/gi18n-lib.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
+#include "e-mail-part-attachment-bar.h"
 
 typedef EMailFormatterExtension EMailFormatterAttachmentBar;
 typedef EMailFormatterExtensionClass EMailFormatterAttachmentBarClass;
 
-GType e_mail_formatter_attachment_bar_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterAttachmentBar,
 	e_mail_formatter_attachment_bar,
diff --git a/em-format/e-mail-formatter-attachment.c b/em-format/e-mail-formatter-attachment.c
index f800ca2994..993b261cca 100644
--- a/em-format/e-mail-formatter-attachment.c
+++ b/em-format/e-mail-formatter-attachment.c
@@ -25,6 +25,7 @@
 #include <shell/e-shell.h>
 #include <shell/e-shell-window.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-inline-filter.h"
 #include "e-mail-part-attachment-bar.h"
@@ -36,8 +37,6 @@
 typedef EMailFormatterExtension EMailFormatterAttachment;
 typedef EMailFormatterExtensionClass EMailFormatterAttachmentClass;
 
-GType e_mail_formatter_attachment_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterAttachment,
 	e_mail_formatter_attachment,
diff --git a/em-format/e-mail-formatter-error.c b/em-format/e-mail-formatter-error.c
index 3adaab90be..1535bef286 100644
--- a/em-format/e-mail-formatter-error.c
+++ b/em-format/e-mail-formatter-error.c
@@ -19,6 +19,7 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
+#include "e-mail-format-extensions.h"
 
 #include <glib/gi18n-lib.h>
 
@@ -29,8 +30,6 @@
 typedef EMailFormatterExtension EMailFormatterError;
 typedef EMailFormatterExtensionClass EMailFormatterErrorClass;
 
-GType e_mail_formatter_error_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterError,
 	e_mail_formatter_error,
diff --git a/em-format/e-mail-formatter-headers.c b/em-format/e-mail-formatter-headers.c
index 3161d88db9..f64f161571 100644
--- a/em-format/e-mail-formatter-headers.c
+++ b/em-format/e-mail-formatter-headers.c
@@ -28,6 +28,7 @@
 #include <e-util/e-util.h>
 #include <shell/e-shell.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-formatter-utils.h"
 #include "e-mail-inline-filter.h"
@@ -35,8 +36,6 @@
 typedef EMailFormatterExtension EMailFormatterHeaders;
 typedef EMailFormatterExtensionClass EMailFormatterHeadersClass;
 
-GType e_mail_formatter_headers_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterHeaders,
 	e_mail_formatter_headers,
diff --git a/em-format/e-mail-formatter-image.c b/em-format/e-mail-formatter-image.c
index 4cdd8443e6..7cfa85eb16 100644
--- a/em-format/e-mail-formatter-image.c
+++ b/em-format/e-mail-formatter-image.c
@@ -24,6 +24,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-inline-filter.h"
 #include "e-mail-parser-extension.h"
@@ -32,8 +33,6 @@
 typedef EMailFormatterExtension EMailFormatterImage;
 typedef EMailFormatterExtensionClass EMailFormatterImageClass;
 
-GType e_mail_formatter_image_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterImage,
 	e_mail_formatter_image,
diff --git a/em-format/e-mail-formatter-message-rfc822.c b/em-format/e-mail-formatter-message-rfc822.c
index 9e88986e98..70c3d20d5b 100644
--- a/em-format/e-mail-formatter-message-rfc822.c
+++ b/em-format/e-mail-formatter-message-rfc822.c
@@ -25,6 +25,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-part-list.h"
 #include "e-mail-part-utils.h"
@@ -32,8 +33,6 @@
 typedef EMailFormatterExtension EMailFormatterMessageRFC822;
 typedef EMailFormatterExtensionClass EMailFormatterMessageRFC822Class;
 
-GType e_mail_formatter_message_rfc822_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterMessageRFC822,
 	e_mail_formatter_message_rfc822,
diff --git a/em-format/e-mail-formatter-print-headers.c b/em-format/e-mail-formatter-print-headers.c
index c3f683f6b3..1499837fba 100644
--- a/em-format/e-mail-formatter-print-headers.c
+++ b/em-format/e-mail-formatter-print-headers.c
@@ -28,6 +28,7 @@
 #include <e-util/e-util.h>
 #include <libemail-engine/e-mail-utils.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-print.h"
 #include "e-mail-formatter-utils.h"
 #include "e-mail-inline-filter.h"
@@ -35,8 +36,6 @@
 typedef EMailFormatterExtension EMailFormatterPrintHeaders;
 typedef EMailFormatterExtensionClass EMailFormatterPrintHeadersClass;
 
-GType e_mail_formatter_print_headers_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterPrintHeaders,
 	e_mail_formatter_print_headers,
diff --git a/em-format/e-mail-formatter-print.c b/em-format/e-mail-formatter-print.c
index 7e15b93e0f..6ca91484a4 100644
--- a/em-format/e-mail-formatter-print.c
+++ b/em-format/e-mail-formatter-print.c
@@ -237,9 +237,9 @@ e_mail_formatter_print_base_init (EMailFormatterPrintClass *class)
 	/* Register internal extensions. */
 	g_type_ensure (e_mail_formatter_print_headers_get_type ());
 
-	e_mail_formatter_extension_registry_load (
-		E_MAIL_FORMATTER_CLASS (class)->extension_registry,
-		E_TYPE_MAIL_FORMATTER_PRINT_EXTENSION);
+	e_mail_formatter_print_internal_extensions_load (
+		E_MAIL_EXTENSION_REGISTRY (
+			E_MAIL_FORMATTER_CLASS (class)->extension_registry));
 
 	E_MAIL_FORMATTER_CLASS (class)->text_html_flags =
 		CAMEL_MIME_FILTER_TOHTML_CONVERT_NL |
diff --git a/em-format/e-mail-formatter-quote-attachment.c b/em-format/e-mail-formatter-quote-attachment.c
index 628ef97ab0..df2977bfa1 100644
--- a/em-format/e-mail-formatter-quote-attachment.c
+++ b/em-format/e-mail-formatter-quote-attachment.c
@@ -26,6 +26,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-quote.h"
 #include "e-mail-part-attachment.h"
 #include "e-mail-part-utils.h"
@@ -35,8 +36,6 @@
 typedef EMailFormatterExtension EMailFormatterQuoteAttachment;
 typedef EMailFormatterExtensionClass EMailFormatterQuoteAttachmentClass;
 
-GType e_mail_formatter_quote_attachment_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterQuoteAttachment,
 	e_mail_formatter_quote_attachment,
diff --git a/em-format/e-mail-formatter-quote-headers.c b/em-format/e-mail-formatter-quote-headers.c
index 8fed82d480..6a6a8b8cce 100644
--- a/em-format/e-mail-formatter-quote-headers.c
+++ b/em-format/e-mail-formatter-quote-headers.c
@@ -28,6 +28,7 @@
 #include <e-util/e-util.h>
 #include <libemail-engine/e-mail-utils.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-quote.h"
 #include "e-mail-formatter-utils.h"
 #include "e-mail-inline-filter.h"
@@ -35,8 +36,6 @@
 typedef EMailFormatterExtension EMailFormatterQuoteHeaders;
 typedef EMailFormatterExtensionClass EMailFormatterQuoteHeadersClass;
 
-GType e_mail_formatter_quote_headers_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterQuoteHeaders,
 	e_mail_formatter_quote_headers,
diff --git a/em-format/e-mail-formatter-quote-message-rfc822.c b/em-format/e-mail-formatter-quote-message-rfc822.c
index 42b3ba5af8..2e885d5f81 100644
--- a/em-format/e-mail-formatter-quote-message-rfc822.c
+++ b/em-format/e-mail-formatter-quote-message-rfc822.c
@@ -27,6 +27,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-quote.h"
 #include "e-mail-part-list.h"
 #include "e-mail-part-utils.h"
@@ -34,8 +35,6 @@
 typedef EMailFormatterExtension EMailFormatterQuoteMessageRFC822;
 typedef EMailFormatterExtensionClass EMailFormatterQuoteMessageRFC822Class;
 
-GType e_mail_formatter_quote_message_rfc822_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterQuoteMessageRFC822,
 	e_mail_formatter_quote_message_rfc822,
diff --git a/em-format/e-mail-formatter-quote-text-enriched.c b/em-format/e-mail-formatter-quote-text-enriched.c
index 031cc664db..ce5170e1d5 100644
--- a/em-format/e-mail-formatter-quote-text-enriched.c
+++ b/em-format/e-mail-formatter-quote-text-enriched.c
@@ -26,14 +26,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-quote.h"
 #include "e-mail-inline-filter.h"
 
 typedef EMailFormatterExtension EMailFormatterQuoteTextEnriched;
 typedef EMailFormatterExtensionClass EMailFormatterQuoteTextEnrichedClass;
 
-GType e_mail_formatter_quote_text_enriched_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterQuoteTextEnriched,
 	e_mail_formatter_quote_text_enriched,
diff --git a/em-format/e-mail-formatter-quote-text-html.c b/em-format/e-mail-formatter-quote-text-html.c
index 71c7d63554..c4559a0d51 100644
--- a/em-format/e-mail-formatter-quote-text-html.c
+++ b/em-format/e-mail-formatter-quote-text-html.c
@@ -27,6 +27,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-quote.h"
 #include "e-mail-part-utils.h"
 #include "e-mail-stripsig-filter.h"
@@ -34,8 +35,6 @@
 typedef EMailFormatterExtension EMailFormatterQuoteTextHTML;
 typedef EMailFormatterExtensionClass EMailFormatterQuoteTextHTMLClass;
 
-GType e_mail_formatter_quote_text_html_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterQuoteTextHTML,
 	e_mail_formatter_quote_text_html,
diff --git a/em-format/e-mail-formatter-quote-text-plain.c b/em-format/e-mail-formatter-quote-text-plain.c
index 71f1762991..e9383d49f1 100644
--- a/em-format/e-mail-formatter-quote-text-plain.c
+++ b/em-format/e-mail-formatter-quote-text-plain.c
@@ -26,6 +26,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-quote.h"
 #include "e-mail-part-utils.h"
 #include "e-mail-stripsig-filter.h"
@@ -33,8 +34,6 @@
 typedef EMailFormatterExtension EMailFormatterQuoteTextPlain;
 typedef EMailFormatterExtensionClass EMailFormatterQuoteTextPlainClass;
 
-GType e_mail_formatter_quote_text_plain_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterQuoteTextPlain,
 	e_mail_formatter_quote_text_plain,
diff --git a/em-format/e-mail-formatter-quote.c b/em-format/e-mail-formatter-quote.c
index 1a2d84deba..a8833eef9d 100644
--- a/em-format/e-mail-formatter-quote.c
+++ b/em-format/e-mail-formatter-quote.c
@@ -170,9 +170,9 @@ e_mail_formatter_quote_base_init (EMailFormatterQuoteClass *class)
 	g_type_ensure (e_mail_formatter_quote_text_html_get_type ());
 	g_type_ensure (e_mail_formatter_quote_text_plain_get_type ());
 
-	e_mail_formatter_extension_registry_load (
-		E_MAIL_FORMATTER_CLASS (class)->extension_registry,
-		E_TYPE_MAIL_FORMATTER_QUOTE_EXTENSION);
+	e_mail_formatter_quote_internal_extensions_load (
+		E_MAIL_EXTENSION_REGISTRY (
+			E_MAIL_FORMATTER_CLASS (class)->extension_registry));
 
 	E_MAIL_FORMATTER_CLASS (class)->text_html_flags =
 		CAMEL_MIME_FILTER_TOHTML_PRE |
diff --git a/em-format/e-mail-formatter-secure-button.c b/em-format/e-mail-formatter-secure-button.c
index 8f66b2ee42..a3efbb28f7 100644
--- a/em-format/e-mail-formatter-secure-button.c
+++ b/em-format/e-mail-formatter-secure-button.c
@@ -19,6 +19,7 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
+#include "e-mail-format-extensions.h"
 
 #include <glib/gi18n-lib.h>
 
@@ -34,8 +35,6 @@
 typedef EMailFormatterExtension EMailFormatterSecureButton;
 typedef EMailFormatterExtensionClass EMailFormatterSecureButtonClass;
 
-GType e_mail_formatter_secure_button_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterSecureButton,
 	e_mail_formatter_secure_button,
diff --git a/em-format/e-mail-formatter-source.c b/em-format/e-mail-formatter-source.c
index e4ee288261..0753b4836e 100644
--- a/em-format/e-mail-formatter-source.c
+++ b/em-format/e-mail-formatter-source.c
@@ -24,14 +24,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-inline-filter.h"
 
 typedef EMailFormatterExtension EMailFormatterSource;
 typedef EMailFormatterExtensionClass EMailFormatterSourceClass;
 
-GType e_mail_formatter_source_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterSource,
 	e_mail_formatter_source,
diff --git a/em-format/e-mail-formatter-text-enriched.c b/em-format/e-mail-formatter-text-enriched.c
index 1ea46e8138..86ee917a9f 100644
--- a/em-format/e-mail-formatter-text-enriched.c
+++ b/em-format/e-mail-formatter-text-enriched.c
@@ -24,14 +24,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-inline-filter.h"
 
 typedef EMailFormatterExtension EMailFormatterTextEnriched;
 typedef EMailFormatterExtensionClass EMailFormatterTextEnrichedClass;
 
-GType e_mail_formatter_text_enriched_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterTextEnriched,
 	e_mail_formatter_text_enriched,
diff --git a/em-format/e-mail-formatter-text-html.c b/em-format/e-mail-formatter-text-html.c
index a70ec2b2f2..b7a0175ed6 100644
--- a/em-format/e-mail-formatter-text-html.c
+++ b/em-format/e-mail-formatter-text-html.c
@@ -26,6 +26,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-inline-filter.h"
 #include "e-mail-part-utils.h"
@@ -33,8 +34,6 @@
 typedef EMailFormatterExtension EMailFormatterTextHTML;
 typedef EMailFormatterExtensionClass EMailFormatterTextHTMLClass;
 
-GType e_mail_formatter_text_html_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterTextHTML,
 	e_mail_formatter_text_html,
diff --git a/em-format/e-mail-formatter-text-plain.c b/em-format/e-mail-formatter-text-plain.c
index 278353b40b..bda6e53ba1 100644
--- a/em-format/e-mail-formatter-text-plain.c
+++ b/em-format/e-mail-formatter-text-plain.c
@@ -24,6 +24,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-formatter-extension.h"
 #include "e-mail-inline-filter.h"
 #include "e-mail-part-utils.h"
@@ -31,8 +32,6 @@
 typedef EMailFormatterExtension EMailFormatterTextPlain;
 typedef EMailFormatterExtensionClass EMailFormatterTextPlainClass;
 
-GType e_mail_formatter_text_plain_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailFormatterTextPlain,
 	e_mail_formatter_text_plain,
diff --git a/em-format/e-mail-formatter.c b/em-format/e-mail-formatter.c
index dcea08133e..83ba48d460 100644
--- a/em-format/e-mail-formatter.c
+++ b/em-format/e-mail-formatter.c
@@ -526,9 +526,8 @@ e_mail_formatter_base_init (EMailFormatterClass *class)
 	class->extension_registry = g_object_new (
 		E_TYPE_MAIL_FORMATTER_EXTENSION_REGISTRY, NULL);
 
-	e_mail_formatter_extension_registry_load (
-		class->extension_registry,
-		E_TYPE_MAIL_FORMATTER_EXTENSION);
+	e_mail_formatter_internal_extensions_load (
+		E_MAIL_EXTENSION_REGISTRY (class->extension_registry));
 
 	e_extensible_load_extensions (
 		E_EXTENSIBLE (class->extension_registry));
diff --git a/em-format/e-mail-parser-application-mbox.c b/em-format/e-mail-parser-application-mbox.c
index b0fde83b2e..c928debeb6 100644
--- a/em-format/e-mail-parser-application-mbox.c
+++ b/em-format/e-mail-parser-application-mbox.c
@@ -25,14 +25,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserApplicationMBox;
 typedef EMailParserExtensionClass EMailParserApplicationMBoxClass;
 
-GType e_mail_parser_application_mbox_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserApplicationMBox,
 	e_mail_parser_application_mbox,
diff --git a/em-format/e-mail-parser-application-smime.c b/em-format/e-mail-parser-application-smime.c
index 13c3d739c1..a5ab0479c6 100644
--- a/em-format/e-mail-parser-application-smime.c
+++ b/em-format/e-mail-parser-application-smime.c
@@ -25,14 +25,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserApplicationSMIME;
 typedef EMailParserExtensionClass EMailParserApplicationSMIMEClass;
 
-GType e_mail_parser_application_smime_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserApplicationSMIME,
 	e_mail_parser_application_smime,
diff --git a/em-format/e-mail-parser-attachment-bar.c b/em-format/e-mail-parser-attachment-bar.c
index 44fbb9cc82..ecc6be677d 100644
--- a/em-format/e-mail-parser-attachment-bar.c
+++ b/em-format/e-mail-parser-attachment-bar.c
@@ -19,6 +19,7 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
+#include "e-mail-format-extensions.h"
 
 #include "e-mail-part-attachment-bar.h"
 
@@ -41,8 +42,6 @@ mail_part_attachment_bar_free (EMailPart *part)
 typedef EMailParserExtension EMailParserAttachmentBar;
 typedef EMailParserExtensionClass EMailParserAttachmentBarClass;
 
-GType e_mail_parser_attachment_bar_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserAttachmentBar,
 	e_mail_parser_attachment_bar,
diff --git a/em-format/e-mail-parser-headers.c b/em-format/e-mail-parser-headers.c
index f2900945d1..009371fa1a 100644
--- a/em-format/e-mail-parser-headers.c
+++ b/em-format/e-mail-parser-headers.c
@@ -26,13 +26,12 @@
 #include <e-util/e-util.h>
 #include <libemail-engine/e-mail-utils.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 
 typedef EMailParserExtension EMailParserHeaders;
 typedef EMailParserExtensionClass EMailParserHeadersClass;
 
-GType e_mail_parser_headers_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserHeaders,
 	e_mail_parser_headers,
diff --git a/em-format/e-mail-parser-image.c b/em-format/e-mail-parser-image.c
index 741daa7454..5360bdb176 100644
--- a/em-format/e-mail-parser-image.c
+++ b/em-format/e-mail-parser-image.c
@@ -24,14 +24,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserImage;
 typedef EMailParserExtensionClass EMailParserImageClass;
 
-GType e_mail_parser_image_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserImage,
 	e_mail_parser_image,
diff --git a/em-format/e-mail-parser-inlinepgp-encrypted.c b/em-format/e-mail-parser-inlinepgp-encrypted.c
index 624452c8b0..99c787199f 100644
--- a/em-format/e-mail-parser-inlinepgp-encrypted.c
+++ b/em-format/e-mail-parser-inlinepgp-encrypted.c
@@ -25,14 +25,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserInlinePGPEncrypted;
 typedef EMailParserExtensionClass EMailParserInlinePGPEncryptedClass;
 
-GType e_mail_parser_inline_pgp_encrypted_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserInlinePGPEncrypted,
 	e_mail_parser_inline_pgp_encrypted,
diff --git a/em-format/e-mail-parser-inlinepgp-signed.c b/em-format/e-mail-parser-inlinepgp-signed.c
index fb65e5c447..faf7be6e22 100644
--- a/em-format/e-mail-parser-inlinepgp-signed.c
+++ b/em-format/e-mail-parser-inlinepgp-signed.c
@@ -25,14 +25,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserInlinePGPSigned;
 typedef EMailParserExtensionClass EMailParserInlinePGPSignedClass;
 
-GType e_mail_parser_inline_pgp_signed_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserInlinePGPSigned,
 	e_mail_parser_inline_pgp_signed,
diff --git a/em-format/e-mail-parser-message-deliverystatus.c b/em-format/e-mail-parser-message-deliverystatus.c
index d02bbf9149..88fa8ce448 100644
--- a/em-format/e-mail-parser-message-deliverystatus.c
+++ b/em-format/e-mail-parser-message-deliverystatus.c
@@ -24,13 +24,12 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 
 typedef EMailParserExtension EMailParserMessageDeliveryStatus;
 typedef EMailParserExtensionClass EMailParserMessageDeliveryStatusClass;
 
-GType e_mail_parser_message_delivery_status_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMessageDeliveryStatus,
 	e_mail_parser_message_delivery_status,
diff --git a/em-format/e-mail-parser-message-external.c b/em-format/e-mail-parser-message-external.c
index d24bb657e1..c6b6de13a7 100644
--- a/em-format/e-mail-parser-message-external.c
+++ b/em-format/e-mail-parser-message-external.c
@@ -26,13 +26,12 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 
 typedef EMailParserExtension EMailParserMessageExternal;
 typedef EMailParserExtensionClass EMailParserMessageExternalClass;
 
-GType e_mail_parser_message_external_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMessageExternal,
 	e_mail_parser_message_external,
diff --git a/em-format/e-mail-parser-message-rfc822.c b/em-format/e-mail-parser-message-rfc822.c
index ca9dd67df9..bafdd62286 100644
--- a/em-format/e-mail-parser-message-rfc822.c
+++ b/em-format/e-mail-parser-message-rfc822.c
@@ -25,6 +25,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-list.h"
 #include "e-mail-part-utils.h"
@@ -32,8 +33,6 @@
 typedef EMailParserExtension EMailParserMessageRFC822;
 typedef EMailParserExtensionClass EMailParserMessageRFC822Class;
 
-GType e_mail_parser_message_rfc822_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMessageRFC822,
 	e_mail_parser_message_rfc822,
diff --git a/em-format/e-mail-parser-message.c b/em-format/e-mail-parser-message.c
index 9cd0a2d76c..696c230876 100644
--- a/em-format/e-mail-parser-message.c
+++ b/em-format/e-mail-parser-message.c
@@ -26,14 +26,13 @@
 #include <e-util/e-util.h>
 #include <libemail-engine/e-mail-utils.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserMessage;
 typedef EMailParserExtensionClass EMailParserMessageClass;
 
-GType e_mail_parser_message_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMessage,
 	e_mail_parser_message,
diff --git a/em-format/e-mail-parser-multipart-alternative.c b/em-format/e-mail-parser-multipart-alternative.c
index cc1c8724db..2e78d0667c 100644
--- a/em-format/e-mail-parser-multipart-alternative.c
+++ b/em-format/e-mail-parser-multipart-alternative.c
@@ -24,14 +24,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserMultipartAlternative;
 typedef EMailParserExtensionClass EMailParserMultipartAlternativeClass;
 
-GType e_mail_parser_multipart_alternative_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMultipartAlternative,
 	e_mail_parser_multipart_alternative,
diff --git a/em-format/e-mail-parser-multipart-appledouble.c b/em-format/e-mail-parser-multipart-appledouble.c
index a866363717..e27bb78039 100644
--- a/em-format/e-mail-parser-multipart-appledouble.c
+++ b/em-format/e-mail-parser-multipart-appledouble.c
@@ -20,13 +20,12 @@
 #include <config.h>
 #endif
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 
 typedef EMailParserExtension EMailParserMultipartAppleDouble;
 typedef EMailParserExtensionClass EMailParserMultipartAppleDoubleClass;
 
-GType e_mail_parser_multipart_apple_double_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMultipartAppleDouble,
 	e_mail_parser_multipart_apple_double,
diff --git a/em-format/e-mail-parser-multipart-digest.c b/em-format/e-mail-parser-multipart-digest.c
index 64d4882a8c..df1b680860 100644
--- a/em-format/e-mail-parser-multipart-digest.c
+++ b/em-format/e-mail-parser-multipart-digest.c
@@ -24,13 +24,12 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 
 typedef EMailParserExtension EMailParserMultipartDigest;
 typedef EMailParserExtensionClass EMailParserMultipartDigestClass;
 
-GType e_mail_parser_multipart_digest_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMultipartDigest,
 	e_mail_parser_multipart_digest,
diff --git a/em-format/e-mail-parser-multipart-encrypted.c b/em-format/e-mail-parser-multipart-encrypted.c
index c815ab543c..f0e2e94b0b 100644
--- a/em-format/e-mail-parser-multipart-encrypted.c
+++ b/em-format/e-mail-parser-multipart-encrypted.c
@@ -24,14 +24,13 @@
 
 #include <libedataserver/libedataserver.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserMultipartEncrypted;
 typedef EMailParserExtensionClass EMailParserMultipartEncryptedClass;
 
-GType e_mail_parser_multipart_encrypted_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMultipartEncrypted,
 	e_mail_parser_multipart_encrypted,
diff --git a/em-format/e-mail-parser-multipart-mixed.c b/em-format/e-mail-parser-multipart-mixed.c
index 9e876eef4e..8fbd55febe 100644
--- a/em-format/e-mail-parser-multipart-mixed.c
+++ b/em-format/e-mail-parser-multipart-mixed.c
@@ -24,14 +24,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserMultipartMixed;
 typedef EMailParserExtensionClass EMailParserMultipartMixedClass;
 
-GType e_mail_parser_multipart_mixed_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMultipartMixed,
 	e_mail_parser_multipart_mixed,
diff --git a/em-format/e-mail-parser-multipart-related.c b/em-format/e-mail-parser-multipart-related.c
index a1cbbf7a41..5d94f656a1 100644
--- a/em-format/e-mail-parser-multipart-related.c
+++ b/em-format/e-mail-parser-multipart-related.c
@@ -24,14 +24,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserMultipartRelated;
 typedef EMailParserExtensionClass EMailParserMultipartRelatedClass;
 
-GType e_mail_parser_multipart_related_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMultipartRelated,
 	e_mail_parser_multipart_related,
diff --git a/em-format/e-mail-parser-multipart-signed.c b/em-format/e-mail-parser-multipart-signed.c
index 514d40fafb..dc3262df34 100644
--- a/em-format/e-mail-parser-multipart-signed.c
+++ b/em-format/e-mail-parser-multipart-signed.c
@@ -24,14 +24,13 @@
 
 #include <libedataserver/libedataserver.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserMultipartSigned;
 typedef EMailParserExtensionClass EMailParserMultipartSignedClass;
 
-GType e_mail_parser_multipart_signed_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserMultipartSigned,
 	e_mail_parser_multipart_signed,
diff --git a/em-format/e-mail-parser-secure-button.c b/em-format/e-mail-parser-secure-button.c
index 38368592c7..59d573ce9a 100644
--- a/em-format/e-mail-parser-secure-button.c
+++ b/em-format/e-mail-parser-secure-button.c
@@ -19,6 +19,7 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
+#include "e-mail-format-extensions.h"
 
 #include <glib/gi18n-lib.h>
 
@@ -29,8 +30,6 @@
 typedef EMailParserExtension EMailParserSecureButton;
 typedef EMailParserExtensionClass EMailParserSecureButtonClass;
 
-GType e_mail_parser_secure_button_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserSecureButton,
 	e_mail_parser_secure_button,
diff --git a/em-format/e-mail-parser-source.c b/em-format/e-mail-parser-source.c
index ff8355db15..d20051d9f3 100644
--- a/em-format/e-mail-parser-source.c
+++ b/em-format/e-mail-parser-source.c
@@ -24,13 +24,12 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 
 typedef EMailParserExtension EMailParserSource;
 typedef EMailParserExtensionClass EMailParserSourceClass;
 
-GType e_mail_parser_source_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserSource,
 	e_mail_parser_source,
diff --git a/em-format/e-mail-parser-text-enriched.c b/em-format/e-mail-parser-text-enriched.c
index 024d160196..2c4edaa612 100644
--- a/em-format/e-mail-parser-text-enriched.c
+++ b/em-format/e-mail-parser-text-enriched.c
@@ -24,14 +24,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserTextEnriched;
 typedef EMailParserExtensionClass EMailParserTextEnrichedClass;
 
-GType e_mail_parser_text_enriched_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserTextEnriched,
 	e_mail_parser_text_enriched,
diff --git a/em-format/e-mail-parser-text-html.c b/em-format/e-mail-parser-text-html.c
index ccfc5d6eb3..3fa17acfc1 100644
--- a/em-format/e-mail-parser-text-html.c
+++ b/em-format/e-mail-parser-text-html.c
@@ -25,14 +25,13 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
 
 typedef EMailParserExtension EMailParserTextHTML;
 typedef EMailParserExtensionClass EMailParserTextHTMLClass;
 
-GType e_mail_parser_text_html_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserTextHTML,
 	e_mail_parser_text_html,
diff --git a/em-format/e-mail-parser-text-plain.c b/em-format/e-mail-parser-text-plain.c
index f0b34e4b2c..bbe7e6e5e3 100644
--- a/em-format/e-mail-parser-text-plain.c
+++ b/em-format/e-mail-parser-text-plain.c
@@ -25,6 +25,7 @@
 
 #include <e-util/e-util.h>
 
+#include "e-mail-format-extensions.h"
 #include "e-mail-inline-filter.h"
 #include "e-mail-parser-extension.h"
 #include "e-mail-part-utils.h"
@@ -32,8 +33,6 @@
 typedef EMailParserExtension EMailParserTextPlain;
 typedef EMailParserExtensionClass EMailParserTextPlainClass;
 
-GType e_mail_parser_text_plain_get_type (void);
-
 G_DEFINE_TYPE (
 	EMailParserTextPlain,
 	e_mail_parser_text_plain,
diff --git a/em-format/e-mail-parser.c b/em-format/e-mail-parser.c
index 359efe7d9b..762302ba80 100644
--- a/em-format/e-mail-parser.c
+++ b/em-format/e-mail-parser.c
@@ -233,7 +233,8 @@ e_mail_parser_base_init (EMailParserClass *class)
 	class->extension_registry = g_object_new (
 		E_TYPE_MAIL_PARSER_EXTENSION_REGISTRY, NULL);
 
-	e_mail_parser_extension_registry_load (class->extension_registry);
+	e_mail_parser_internal_extensions_load (
+		E_MAIL_EXTENSION_REGISTRY (class->extension_registry));
 
 	e_extensible_load_extensions (E_EXTENSIBLE (class->extension_registry));
 }
diff --git a/modules/audio-inline/e-mail-formatter-audio-inline.c b/modules/audio-inline/e-mail-formatter-audio-inline.c
index 7abcf934fa..235315a64d 100644
--- a/modules/audio-inline/e-mail-formatter-audio-inline.c
+++ b/modules/audio-inline/e-mail-formatter-audio-inline.c
@@ -43,12 +43,18 @@ typedef EExtension EMailFormatterAudioInlineLoader;
 typedef EExtensionClass EMailFormatterAudioInlineLoaderClass;
 
 GType e_mail_formatter_audio_inline_get_type (void);
+GType e_mail_formatter_audio_inline_loader_get_type (void);
 
 G_DEFINE_DYNAMIC_TYPE (
 	EMailFormatterAudioInline,
 	e_mail_formatter_audio_inline,
 	E_TYPE_MAIL_FORMATTER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailFormatterAudioInlineLoader,
+	e_mail_formatter_audio_inline_loader,
+	E_TYPE_EXTENSION)
+
 static const gchar *formatter_mime_types[] = {
 	"application/vnd.evolution.widget.audio-inline",
 	"audio/ac3",
@@ -323,9 +329,44 @@ e_mail_formatter_audio_inline_init (EMailFormatterExtension *extension)
 {
 }
 
+static void
+mail_formatter_audio_inline_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		formatter_mime_types,
+		e_mail_formatter_audio_inline_get_type ());
+}
+
+static void
+e_mail_formatter_audio_inline_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_formatter_audio_inline_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_FORMATTER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_formatter_audio_inline_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_formatter_audio_inline_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_formatter_audio_inline_type_register (GTypeModule *type_module)
 {
 	e_mail_formatter_audio_inline_register_type (type_module);
+	e_mail_formatter_audio_inline_loader_register_type (type_module);
 }
 
diff --git a/modules/audio-inline/e-mail-parser-audio-inline.c b/modules/audio-inline/e-mail-parser-audio-inline.c
index 1ebbf905ba..a4ef834e1e 100644
--- a/modules/audio-inline/e-mail-parser-audio-inline.c
+++ b/modules/audio-inline/e-mail-parser-audio-inline.c
@@ -45,12 +45,18 @@ typedef EExtension EMailParserAudioInlineLoader;
 typedef EExtensionClass EMailParserAudioInlineLoaderClass;
 
 GType e_mail_parser_audio_inline_get_type (void);
+GType e_mail_parser_audio_inline_loader_get_type (void);
 
 G_DEFINE_DYNAMIC_TYPE (
 	EMailParserAudioInline,
 	e_mail_parser_audio_inline,
 	E_TYPE_MAIL_PARSER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailParserAudioInlineLoader,
+	e_mail_parser_audio_inline_loader,
+	E_TYPE_EXTENSION)
+
 static const gchar *parser_mime_types[] = {
 	"audio/ac3",
 	"audio/x-ac3",
@@ -158,9 +164,44 @@ e_mail_parser_audio_inline_init (EMailParserExtension *extension)
 {
 }
 
+static void
+mail_parser_audio_inline_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		parser_mime_types,
+		e_mail_parser_audio_inline_get_type ());
+}
+
+static void
+e_mail_parser_audio_inline_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_parser_audio_inline_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_PARSER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_parser_audio_inline_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_parser_audio_inline_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_parser_audio_inline_type_register (GTypeModule *type_module)
 {
 	e_mail_parser_audio_inline_register_type (type_module);
+	e_mail_parser_audio_inline_loader_register_type (type_module);
 }
 
diff --git a/modules/itip-formatter/e-mail-formatter-itip.c b/modules/itip-formatter/e-mail-formatter-itip.c
index 500810b639..6d5a3f1ac1 100644
--- a/modules/itip-formatter/e-mail-formatter-itip.c
+++ b/modules/itip-formatter/e-mail-formatter-itip.c
@@ -37,6 +37,9 @@
 typedef EMailFormatterExtension EMailFormatterItip;
 typedef EMailFormatterExtensionClass EMailFormatterItipClass;
 
+typedef EExtension EMailFormatterItipLoader;
+typedef EExtensionClass EMailFormatterItipLoaderClass;
+
 GType e_mail_formatter_itip_get_type (void);
 GType e_mail_formatter_itip_loader_get_type (void);
 
@@ -45,6 +48,11 @@ G_DEFINE_DYNAMIC_TYPE (
 	e_mail_formatter_itip,
 	E_TYPE_MAIL_FORMATTER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailFormatterItipLoader,
+	e_mail_formatter_itip_loader,
+	E_TYPE_EXTENSION)
+
 static const gchar *formatter_mime_types[] = {
 	"text/calendar",
 	"application/ics",
@@ -158,8 +166,43 @@ e_mail_formatter_itip_init (EMailFormatterExtension *extension)
 {
 }
 
+static void
+mail_formatter_itip_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		formatter_mime_types,
+		e_mail_formatter_itip_get_type ());
+}
+
+static void
+e_mail_formatter_itip_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_formatter_itip_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_FORMATTER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_formatter_itip_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_formatter_itip_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_formatter_itip_type_register (GTypeModule *type_module)
 {
 	e_mail_formatter_itip_register_type (type_module);
+	e_mail_formatter_itip_loader_register_type (type_module);
 }
diff --git a/modules/itip-formatter/e-mail-parser-itip.c b/modules/itip-formatter/e-mail-parser-itip.c
index 9e5ff46e45..5d2cb458f1 100644
--- a/modules/itip-formatter/e-mail-parser-itip.c
+++ b/modules/itip-formatter/e-mail-parser-itip.c
@@ -50,12 +50,18 @@ typedef EExtension EMailParserItipLoader;
 typedef EExtensionClass EMailParserItipLoaderClass;
 
 GType e_mail_parser_itip_get_type (void);
+GType e_mail_parser_itip_loader_get_type (void);
 
 G_DEFINE_DYNAMIC_TYPE (
 	EMailParserItip,
 	e_mail_parser_itip,
 	E_TYPE_MAIL_PARSER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailParserItipLoader,
+	e_mail_parser_itip_loader,
+	E_TYPE_EXTENSION)
+
 static const gchar *parser_mime_types[] = {
 	"text/calendar",
 	"application/ics",
@@ -259,9 +265,44 @@ e_mail_parser_itip_init (EMailParserExtension *class)
 {
 }
 
+static void
+mail_parser_itip_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		parser_mime_types,
+		e_mail_parser_itip_get_type ());
+}
+
+static void
+e_mail_parser_itip_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_parser_itip_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_PARSER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_parser_itip_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_parser_itip_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_parser_itip_type_register (GTypeModule *type_module)
 {
 	e_mail_parser_itip_register_type (type_module);
+	e_mail_parser_itip_loader_register_type (type_module);
 }
 
diff --git a/modules/prefer-plain/e-mail-parser-prefer-plain.c b/modules/prefer-plain/e-mail-parser-prefer-plain.c
index 914b96952d..dfe4b22092 100644
--- a/modules/prefer-plain/e-mail-parser-prefer-plain.c
+++ b/modules/prefer-plain/e-mail-parser-prefer-plain.c
@@ -51,6 +51,7 @@ struct _EMailParserPreferPlainClass {
 };
 
 GType e_mail_parser_prefer_plain_get_type (void);
+GType e_mail_parser_prefer_plain_loader_get_type (void);
 
 enum {
 	PREFER_HTML,
@@ -63,6 +64,11 @@ G_DEFINE_DYNAMIC_TYPE (
 	e_mail_parser_prefer_plain,
 	E_TYPE_MAIL_PARSER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailParserPreferPlainLoader,
+	e_mail_parser_prefer_plain_loader,
+	E_TYPE_EXTENSION)
+
 static const gchar *parser_mime_types[] = {
 	"multipart/alternative",
 	"text/html",
@@ -499,9 +505,44 @@ e_mail_parser_prefer_plain_init (EMailParserPreferPlain *parser)
 	parser->show_suppressed = g_settings_get_boolean (parser->settings, "show-suppressed");
 }
 
+static void
+mail_parser_prefer_plain_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		parser_mime_types,
+		e_mail_parser_prefer_plain_get_type ());
+}
+
+static void
+e_mail_parser_prefer_plain_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_parser_prefer_plain_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_PARSER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_parser_prefer_plain_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_parser_prefer_plain_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_parser_prefer_plain_type_register (GTypeModule *type_module)
 {
 	e_mail_parser_prefer_plain_register_type (type_module);
+	e_mail_parser_prefer_plain_loader_register_type (type_module);
 }
 
diff --git a/modules/text-highlight/e-mail-formatter-text-highlight.c b/modules/text-highlight/e-mail-formatter-text-highlight.c
index 5e8c15c16c..ea4cb6c839 100644
--- a/modules/text-highlight/e-mail-formatter-text-highlight.c
+++ b/modules/text-highlight/e-mail-formatter-text-highlight.c
@@ -45,12 +45,18 @@ typedef EExtension EMailFormatterTextHighlightLoader;
 typedef EExtensionClass EMailFormatterTextHighlightLoaderClass;
 
 GType e_mail_formatter_text_highlight_get_type (void);
+GType e_mail_formatter_text_highlight_loader_get_type (void);
 
 G_DEFINE_DYNAMIC_TYPE (
 	EMailFormatterTextHighlight,
 	e_mail_formatter_text_highlight,
 	E_TYPE_MAIL_FORMATTER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailFormatterTextHighlightLoader,
+	e_mail_formatter_text_highlight_loader,
+	E_TYPE_EXTENSION)
+
 static gchar *
 get_default_font (void)
 {
@@ -384,9 +390,44 @@ e_mail_formatter_text_highlight_init (EMailFormatterExtension *extension)
 {
 }
 
+static void
+mail_formatter_text_highlight_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		get_mime_types (),
+		e_mail_formatter_text_highlight_get_type ());
+}
+
+static void
+e_mail_formatter_text_highlight_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_formatter_text_highlight_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_FORMATTER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_formatter_text_highlight_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_formatter_text_highlight_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_formatter_text_highlight_type_register (GTypeModule *type_module)
 {
 	e_mail_formatter_text_highlight_register_type (type_module);
+	e_mail_formatter_text_highlight_loader_register_type (type_module);
 }
 
diff --git a/modules/text-highlight/e-mail-parser-text-highlight.c b/modules/text-highlight/e-mail-parser-text-highlight.c
index 28d10409b1..99d920fe0b 100644
--- a/modules/text-highlight/e-mail-parser-text-highlight.c
+++ b/modules/text-highlight/e-mail-parser-text-highlight.c
@@ -41,12 +41,18 @@ typedef EExtension EMailParserTextHighlightLoader;
 typedef EExtensionClass EMailParserTextHighlightLoaderClass;
 
 GType e_mail_parser_text_highlight_get_type (void);
+GType e_mail_parser_text_highlight_loader_get_type (void);
 
 G_DEFINE_DYNAMIC_TYPE (
 	EMailParserTextHighlight,
 	e_mail_parser_text_highlight,
 	E_TYPE_MAIL_PARSER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailParserTextHighlightLoader,
+	e_mail_parser_text_highlight_loader,
+	E_TYPE_EXTENSION)
+
 static gboolean
 empe_text_highlight_parse (EMailParserExtension *extension,
                            EMailParser *parser,
@@ -104,9 +110,44 @@ e_mail_parser_text_highlight_init (EMailParserExtension *extension)
 {
 }
 
+static void
+mail_parser_text_highlight_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		get_mime_types (),
+		e_mail_parser_text_highlight_get_type ());
+}
+
+static void
+e_mail_parser_text_highlight_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_parser_text_highlight_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_PARSER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_parser_text_highlight_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_parser_text_highlight_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_parser_text_highlight_type_register (GTypeModule *type_module)
 {
 	e_mail_parser_text_highlight_register_type (type_module);
+	e_mail_parser_text_highlight_loader_register_type (type_module);
 }
 
diff --git a/modules/tnef-attachment/e-mail-parser-tnef-attachment.c b/modules/tnef-attachment/e-mail-parser-tnef-attachment.c
index dc93b91955..cc9d024349 100644
--- a/modules/tnef-attachment/e-mail-parser-tnef-attachment.c
+++ b/modules/tnef-attachment/e-mail-parser-tnef-attachment.c
@@ -64,12 +64,18 @@ typedef EExtension EMailParserTnefAttachmentLoader;
 typedef EExtensionClass EMailParserTnefAttachmentLoaderClass;
 
 GType e_mail_parser_tnef_attachment_get_type (void);
+GType e_mail_parser_tnef_attachment_loader_get_type (void);
 
 G_DEFINE_DYNAMIC_TYPE (
 	EMailParserTnefAttachment,
 	e_mail_parser_tnef_attachment,
 	E_TYPE_MAIL_PARSER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailParserTnefAttachmentLoader,
+	e_mail_parser_tnef_attachment_loader,
+	E_TYPE_EXTENSION)
+
 static const gchar *parser_mime_types[] = {
 	"application/vnd.ms-tnef",
 	"application/ms-tnefl",
@@ -274,10 +280,45 @@ e_mail_parser_tnef_attachment_init (EMailParserTnefAttachment *extension)
 {
 }
 
+static void
+mail_parser_tnef_attachment_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		parser_mime_types,
+		e_mail_parser_tnef_attachment_get_type ());
+}
+
+static void
+e_mail_parser_tnef_attachment_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_parser_tnef_attachment_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_PARSER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_parser_tnef_attachment_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_parser_tnef_attachment_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_parser_tnef_attachment_type_register (GTypeModule *type_module)
 {
 	e_mail_parser_tnef_attachment_register_type (type_module);
+	e_mail_parser_tnef_attachment_loader_register_type (type_module);
 }
 
 void
diff --git a/modules/vcard-inline/e-mail-formatter-vcard-inline.c b/modules/vcard-inline/e-mail-formatter-vcard-inline.c
index bcced23351..3032f23560 100644
--- a/modules/vcard-inline/e-mail-formatter-vcard-inline.c
+++ b/modules/vcard-inline/e-mail-formatter-vcard-inline.c
@@ -43,12 +43,18 @@ typedef EExtension EMailFormatterVCardInlineLoader;
 typedef EExtensionClass EMailFormatterVCardInlineLoaderClass;
 
 GType e_mail_formatter_vcard_inline_get_type (void);
+GType e_mail_formatter_vcard_inline_loader_get_type (void);
 
 G_DEFINE_DYNAMIC_TYPE (
 	EMailFormatterVCardInline,
 	e_mail_formatter_vcard_inline,
 	E_TYPE_MAIL_FORMATTER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailFormatterVCardInlineLoader,
+	e_mail_formatter_vcard_inline_loader,
+	E_TYPE_EXTENSION)
+
 static const gchar *formatter_mime_types[] = {
 	"text/vcard",
 	"text/x-vcard",
@@ -217,9 +223,44 @@ e_mail_formatter_vcard_inline_init (EMailFormatterExtension *extension)
 {
 }
 
+static void
+mail_formatter_vcard_inline_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		formatter_mime_types,
+		e_mail_formatter_vcard_inline_get_type ());
+}
+
+static void
+e_mail_formatter_vcard_inline_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_formatter_vcard_inline_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_FORMATTER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_formatter_vcard_inline_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_formatter_vcard_inline_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_formatter_vcard_inline_type_register (GTypeModule *type_module)
 {
 	e_mail_formatter_vcard_inline_register_type (type_module);
+	e_mail_formatter_vcard_inline_loader_register_type (type_module);
 }
 
diff --git a/modules/vcard-inline/e-mail-parser-vcard-inline.c b/modules/vcard-inline/e-mail-parser-vcard-inline.c
index b871351d0a..c1064dd28f 100644
--- a/modules/vcard-inline/e-mail-parser-vcard-inline.c
+++ b/modules/vcard-inline/e-mail-parser-vcard-inline.c
@@ -54,12 +54,18 @@ typedef EExtension EMailParserVCardInlineLoader;
 typedef EExtensionClass EMailParserVCardInlineLoaderClass;
 
 GType e_mail_parser_vcard_inline_get_type (void);
+GType e_mail_parser_vcard_inline_loader_get_type (void);
 
 G_DEFINE_DYNAMIC_TYPE (
 	EMailParserVCardInline,
 	e_mail_parser_vcard_inline,
 	E_TYPE_MAIL_PARSER_EXTENSION)
 
+G_DEFINE_DYNAMIC_TYPE (
+	EMailParserVCardInlineLoader,
+	e_mail_parser_vcard_inline_loader,
+	E_TYPE_EXTENSION)
+
 static const gchar *parser_mime_types[] = {
 	"text/vcard",
 	"text/x-vcard",
@@ -382,9 +388,44 @@ e_mail_parser_vcard_inline_init (EMailParserExtension *extension)
 {
 }
 
+static void
+mail_parser_vcard_inline_loader_constructed (GObject *object)
+{
+	EExtensible *extensible;
+
+	extensible = e_extension_get_extensible (E_EXTENSION (object));
+
+	e_mail_extension_registry_add_extension (
+		E_MAIL_EXTENSION_REGISTRY (extensible),
+		parser_mime_types,
+		e_mail_parser_vcard_inline_get_type ());
+}
+
+static void
+e_mail_parser_vcard_inline_loader_class_init (EExtensionClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+	object_class->constructed = mail_parser_vcard_inline_loader_constructed;
+
+	class->extensible_type = E_TYPE_MAIL_PARSER_EXTENSION_REGISTRY;
+}
+
+static void
+e_mail_parser_vcard_inline_loader_class_finalize (EExtensionClass *class)
+{
+}
+
+static void
+e_mail_parser_vcard_inline_loader_init (EExtension *extension)
+{
+}
+
 void
 e_mail_parser_vcard_inline_type_register (GTypeModule *type_module)
 {
 	e_mail_parser_vcard_inline_register_type (type_module);
+	e_mail_parser_vcard_inline_loader_register_type (type_module);
 }