Feature Flag + Mobile Sync (#5955)

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+# Secret Preferences
+
+Sometimes we want to test a feature in the wild that may not be ready for public consumption.
+
+One example is our "sync with mobile" feature, which didn't make sense to roll out before the mobile version was live.
+
+To enable features like this, first open the background console, and then you can use the global method `global.setPreference(key, value)`.
+
+For example, if the feature flag was a booelan was called `mobileSync`, you might type `setPreference('mobileSync', true)`.
+