New settings custom rpc form (#6490)

* Add networks tab to settings, with header.

* Adds network list to settings network tab.

* Adds form to settings networks tab and connects it to network list.

* Network tab: form adding and editing working

* Settings network form properly handles input errors

* Add translations for settings network form

* Clean up styles of settings network tab.

* Add popup-view styles and behaviour to settings network tab.

* Fix save button on settings network form

* Adds 'Add Network' button and addMode to settings networks tab

* Lint fix for settings networks tab addition

* Fix navigation in settings networks tab.

* Editing an rpcurl in networks tab does not create new network, just changes rpc of old

* Fix layout of settings tabs other than network

* Networks dropdown 'Custom Rpc' item links to networks tab in settings.

* Update settings sidebar networks subheader.

* Make networks tab buttons width consistent with input widths in extension view.

* Fix settings screen subheader height in popup view

* Fix height of add networks button in popup view

* Add optional label to chainId and symbol form labels in networks setting tab

* Style fixes for networks tab headers

* Add ability to customize block explorer used by custom rpc

* Stylistic improvements+fixes to custom rpc form.

* Hide cancel button.

* Highlight and show network form of provider by default.

* Standardize network subheader name to 'Networks'

* Update e2e tests for new settings network form

* Update unit tests for new rpcPrefs prop

* Extract blockexplorer url construction into method.

* Fix broken styles on non-network tabs in popup mode

* Fix block explorer url links for cases when provider in state has not been updated.

* Fix vertical spacing of network form

* Don't allow click of save button on network form if nothing has changed

* Ensure add network button is shown in popup view

* Lint fix for networks tab

* Fix block explorer url preference setting.

* Fix e2e tests for custom blockexplorer in account details modal changes.

* Update integration test states to include frequentRpcList property

* Fix some capitalizations in en/messages.json

* Remove some console.logs added during custom rpc form work

* Fix external account link text and url for modal and dropdown.

* Documentation, url validation, proptype required additions and lint fixes on network tab and form.

36 files changed, 1028 insertions, 68 deletions

diff --git a/app/_locales/en/messages.json b/app/_locales/en/messages.json
index 7a5f9297c..254bfdfb9 100644
--- a/app/_locales/en/messages.json
+++ b/app/_locales/en/messages.json
@@ -83,6 +83,9 @@
   "address": {
     "message": "Address"
   },
+  "addNetwork": {
+    "message": "Add Network"
+  },
   "advanced": {
     "message": "Advanced"
   },
@@ -191,6 +194,13 @@
     "message": "must be greater than or equal to $1 and less than or equal to $2.",
     "description": "helper for inputting hex as decimal input"
   },
+  "blockExplorerUrl": {
+    "message": "Block Explorer"
+  },
+  "blockExplorerView": {
+    "message": "View account at $1",
+    "description": "$1 replaced by URL for custom block explorer"
+  },
   "blockiesIdenticon": {
     "message": "Use Blockies Identicon"
   },
@@ -230,6 +240,9 @@
   "ok": {
     "message": "Ok"
   },
+  "optionalBlockExplorerUrl": {
+    "message": "Block Explorer URL (optional)"
+  },
   "cancel": {
     "message": "Cancel"
   },
@@ -245,6 +258,9 @@
   "cancelN": {
     "message": "Cancel all $1 transactions"
   },
+  "chainId": {
+    "message": "Chain ID"
+  },
   "classicInterface": {
     "message": "Use classic interface"
   },
@@ -502,6 +518,9 @@
   "edit": {
     "message": "Edit"
   },
+  "editNetwork": {
+    "message": "Edit Network"
+  },
   "editAccountName": {
     "message": "Edit Account Name"
   },
@@ -934,9 +953,15 @@
   "negativeETH": {
     "message": "Can not send negative amounts of ETH."
   },
+  "networkName": {
+    "message": "Network Name"
+  },
   "networks": {
     "message": "Networks"
   },
+  "networkSettingsDescription": {
+    "message": "Add and edit custom RPC networks"
+  },
   "nevermind": {
     "message": "Nevermind"
   },
@@ -977,7 +1002,7 @@
   "protectYourKeysMessage2": {
     "message": "Keep your phrase safe. If you see something fishy, or you’re uncertain about a website, email support@metamask.io"
   },
-  "rpcURL": {
+  "rpcUrl": {
     "message": "New RPC URL"
   },
   "showAdvancedOptions": {
@@ -1492,6 +1517,9 @@
   "supportCenter": {
     "message": "Visit our Support Center"
   },
+  "symbol": {
+    "message": "Symbol"
+  },
   "symbolBetweenZeroTwelve": {
     "message": "Symbol must be between 0 and 12 characters."
   },
@@ -1714,9 +1742,15 @@
   "viewAccount": {
     "message": "View Account"
   },
+  "viewOnCustomBlockExplorer": {
+    "message": "View at $1"
+  },
   "viewOnEtherscan": {
     "message": "View on Etherscan"
   },
+  "viewNetworkInfo": {
+    "message": "View Network Info"
+  },
   "visitWebSite": {
     "message": "Visit our web site"
   },
diff --git a/app/scripts/controllers/network/network.js b/app/scripts/controllers/network/network.js
index fc8e0df5d..2c68e4378 100644
--- a/app/scripts/controllers/network/network.js
+++ b/app/scripts/controllers/network/network.js
@@ -129,13 +129,14 @@ module.exports = class NetworkController extends EventEmitter {
     })
   }
 
-  setRpcTarget (rpcTarget, chainId, ticker = 'ETH', nickname = '') {
+  setRpcTarget (rpcTarget, chainId, ticker = 'ETH', nickname = '', rpcPrefs) {
     const providerConfig = {
       type: 'rpc',
       rpcTarget,
       chainId,
       ticker,
       nickname,
+      rpcPrefs,
     }
     this.providerConfig = providerConfig
   }
diff --git a/app/scripts/controllers/preferences.js b/app/scripts/controllers/preferences.js
index bbb13bd8e..acf952bb1 100644
--- a/app/scripts/controllers/preferences.js
+++ b/app/scripts/controllers/preferences.js
@@ -488,8 +488,8 @@ class PreferencesController {
       rpcList[index] = updatedRpc
       this.store.updateState({ frequentRpcListDetail: rpcList })
     } else {
-      const { rpcUrl, chainId, ticker, nickname } = newRpcDetails
-      return this.addToFrequentRpcList(rpcUrl, chainId, ticker, nickname)
+      const { rpcUrl, chainId, ticker, nickname, rpcPrefs = {} } = newRpcDetails
+      return this.addToFrequentRpcList(rpcUrl, chainId, ticker, nickname, rpcPrefs)
     }
     return Promise.resolve(rpcList)
   }
@@ -503,22 +503,22 @@ class PreferencesController {
    * @returns {Promise<array>} Promise resolving to updated frequentRpcList.
    *
    */
-  addToFrequentRpcList (url, chainId, ticker = 'ETH', nickname = '') {
-    const rpcList = this.getFrequentRpcListDetail()
-    const index = rpcList.findIndex((element) => { return element.rpcUrl === url })
-    if (index !== -1) {
-      rpcList.splice(index, 1)
-    }
-    if (url !== 'http://localhost:8545') {
-      let checkedChainId
-      if (!!chainId && !Number.isNaN(parseInt(chainId))) {
-        checkedChainId = chainId
+    addToFrequentRpcList (url, chainId, ticker = 'ETH', nickname = '', rpcPrefs = {}) {
+      const rpcList = this.getFrequentRpcListDetail()
+      const index = rpcList.findIndex((element) => { return element.rpcUrl === url })
+      if (index !== -1) {
+        rpcList.splice(index, 1)
       }
-      rpcList.push({ rpcUrl: url, chainId: checkedChainId, ticker, nickname })
+      if (url !== 'http://localhost:8545') {
+        let checkedChainId
+        if (!!chainId && !Number.isNaN(parseInt(chainId))) {
+          checkedChainId = chainId
+        }
+        rpcList.push({ rpcUrl: url, chainId: checkedChainId, ticker, nickname, rpcPrefs })
+      }
+      this.store.updateState({ frequentRpcListDetail: rpcList })
+      return Promise.resolve(rpcList)
     }
-    this.store.updateState({ frequentRpcListDetail: rpcList })
-    return Promise.resolve(rpcList)
-  }
 
   /**
    * Removes custom RPC url from state.
diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index b190dd452..cc9d51d3c 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -1633,9 +1633,9 @@ module.exports = class MetamaskController extends EventEmitter {
    * @returns {Promise<String>} - The RPC Target URL confirmed.
    */
 
-  async updateAndSetCustomRpc (rpcUrl, chainId, ticker = 'ETH', nickname) {
-    await this.preferencesController.updateRpc({ rpcUrl, chainId, ticker, nickname })
-    this.networkController.setRpcTarget(rpcUrl, chainId, ticker, nickname)
+  async updateAndSetCustomRpc (rpcUrl, chainId, ticker = 'ETH', nickname, rpcPrefs) {
+    await this.preferencesController.updateRpc({ rpcUrl, chainId, ticker, nickname, rpcPrefs })
+    this.networkController.setRpcTarget(rpcUrl, chainId, ticker, nickname, rpcPrefs)
     return rpcUrl
   }
 
@@ -1648,15 +1648,15 @@ module.exports = class MetamaskController extends EventEmitter {
    * @param {string} nickname - Optional nickname of the selected network.
    * @returns {Promise<String>} - The RPC Target URL confirmed.
    */
-  async setCustomRpc (rpcTarget, chainId, ticker = 'ETH', nickname = '') {
+  async setCustomRpc (rpcTarget, chainId, ticker = 'ETH', nickname = '', rpcPrefs = {}) {
     const frequentRpcListDetail = this.preferencesController.getFrequentRpcListDetail()
     const rpcSettings = frequentRpcListDetail.find((rpc) => rpcTarget === rpc.rpcUrl)
 
     if (rpcSettings) {
-      this.networkController.setRpcTarget(rpcSettings.rpcUrl, rpcSettings.chainId, rpcSettings.ticker, rpcSettings.nickname)
+      this.networkController.setRpcTarget(rpcSettings.rpcUrl, rpcSettings.chainId, rpcSettings.ticker, rpcSettings.nickname, rpcPrefs)
     } else {
-      this.networkController.setRpcTarget(rpcTarget, chainId, ticker, nickname)
-      await this.preferencesController.addToFrequentRpcList(rpcTarget, chainId, ticker, nickname)
+      this.networkController.setRpcTarget(rpcTarget, chainId, ticker, nickname, rpcPrefs)
+      await this.preferencesController.addToFrequentRpcList(rpcTarget, chainId, ticker, nickname, rpcPrefs)
     }
     return rpcTarget
   }
diff --git a/development/states/conf-tx.json b/development/states/conf-tx.json
index d47b26fd4..7b278f331 100644
--- a/development/states/conf-tx.json
+++ b/development/states/conf-tx.json
@@ -192,7 +192,8 @@
       "type": "testnet"
     },
     "shapeShiftTxList": [],
-    "lostAccounts": []
+    "lostAccounts": [],
+    "frequentRpcListDetail": []
   },
   "appState": {
     "menuOpen": false,
diff --git a/development/states/confirm-new-ui.json b/development/states/confirm-new-ui.json
index 4019bede8..c9340fc8f 100644
--- a/development/states/confirm-new-ui.json
+++ b/development/states/confirm-new-ui.json
@@ -134,7 +134,8 @@
       "useNativeCurrencyAsPrimaryCurrency": true,
       "showFiatInTestnets": true
     },
-    "completedUiMigration": true
+    "completedUiMigration": true,
+    "frequentRpcListDetail": []
   },
   "appState": {
     "menuOpen": false,
diff --git a/development/states/confirm-sig-requests.json b/development/states/confirm-sig-requests.json
index 9bf69c700..d531b2ef7 100644
--- a/development/states/confirm-sig-requests.json
+++ b/development/states/confirm-sig-requests.json
@@ -157,7 +157,8 @@
     "preferences": {
       "useNativeCurrencyAsPrimaryCurrency": true
     },
-    "completedUiMigration": true
+    "completedUiMigration": true,
+    "frequentRpcListDetail": []
   },
   "appState": {
     "menuOpen": false,
diff --git a/development/states/currency-localization.json b/development/states/currency-localization.json
index faacb25de..a9a37ecd0 100644
--- a/development/states/currency-localization.json
+++ b/development/states/currency-localization.json
@@ -116,7 +116,8 @@
       "useNativeCurrencyAsPrimaryCurrency": true,
       "showFiatInTestnets": true
     },
-    "completedUiMigration": true
+    "completedUiMigration": true,
+    "frequentRpcListDetail": []
   },
   "appState": {
     "menuOpen": false,
diff --git a/development/states/send-edit.json b/development/states/send-edit.json
index 71421d29f..7c7e8f097 100644
--- a/development/states/send-edit.json
+++ b/development/states/send-edit.json
@@ -138,7 +138,8 @@
       "useNativeCurrencyAsPrimaryCurrency": true,
       "showFiatInTestnets": true
     },
-    "completedUiMigration": true
+    "completedUiMigration": true,
+    "frequentRpcListDetail": []
   },
   "appState": {
     "menuOpen": false,
diff --git a/development/states/send-new-ui.json b/development/states/send-new-ui.json
index 8709d096b..75982f318 100644
--- a/development/states/send-new-ui.json
+++ b/development/states/send-new-ui.json
@@ -117,7 +117,8 @@
       "useNativeCurrencyAsPrimaryCurrency": true,
       "showFiatInTestnets": true
     },
-    "completedUiMigration": true
+    "completedUiMigration": true,
+    "frequentRpcListDetail": []
   },
   "appState": {
     "menuOpen": false,
diff --git a/development/states/send.json b/development/states/send.json
index 8ae385564..c71516edc 100644
--- a/development/states/send.json
+++ b/development/states/send.json
@@ -87,7 +87,8 @@
       "type": "testnet"
     },
     "shapeShiftTxList": [],
-    "lostAccounts": []
+    "lostAccounts": [],
+    "frequentRpcListDetail": []
   },
   "appState": {
     "menuOpen": false,
diff --git a/development/states/tx-list-items.json b/development/states/tx-list-items.json
index 1f7539e7b..4190ee149 100644
--- a/development/states/tx-list-items.json
+++ b/development/states/tx-list-items.json
@@ -1059,7 +1059,8 @@
     "preferences": {
       "useNativeCurrencyAsPrimaryCurrency": true
     },
-    "completedUiMigration": true
+    "completedUiMigration": true,
+    "frequentRpcListDetail": []
   },
   "appState": {
     "menuOpen": false,
diff --git a/test/e2e/beta/metamask-beta-ui.spec.js b/test/e2e/beta/metamask-beta-ui.spec.js
index 05ad84f24..7fb3de6e4 100644
--- a/test/e2e/beta/metamask-beta-ui.spec.js
+++ b/test/e2e/beta/metamask-beta-ui.spec.js
@@ -1341,11 +1341,14 @@ describe('MetaMask', function () {
         await customRpcButton.click()
         await delay(regularDelayMs)
 
-        const customRpcInput = await findElement(driver, By.css('input[placeholder="New RPC URL"]'))
+        await findElement(driver, By.css('.settings-page__sub-header-text'))
+
+        const customRpcInputs = await findElements(driver, By.css('input[type="text"]'))
+        const customRpcInput = customRpcInputs[1]
         await customRpcInput.clear()
         await customRpcInput.sendKeys(customRpcUrl)
 
-        const customRpcSave = await findElement(driver, By.css('.settings-tab__rpc-save-button'))
+        const customRpcSave = await findElement(driver, By.css('.page-container__footer-button'))
         await customRpcSave.click()
         await delay(largeDelayMs * 2)
       })
diff --git a/test/unit/app/controllers/preferences-controller-test.js b/test/unit/app/controllers/preferences-controller-test.js
index 558597ae7..81b152f3d 100644
--- a/test/unit/app/controllers/preferences-controller-test.js
+++ b/test/unit/app/controllers/preferences-controller-test.js
@@ -527,14 +527,14 @@ describe('preferences controller', function () {
     it('should add custom RPC url to state', function () {
       preferencesController.addToFrequentRpcList('rpc_url', 1)
       preferencesController.addToFrequentRpcList('http://localhost:8545', 1)
-      assert.deepEqual(preferencesController.store.getState().frequentRpcListDetail, [{ rpcUrl: 'rpc_url', chainId: 1, ticker: 'ETH', nickname: '' }])
+      assert.deepEqual(preferencesController.store.getState().frequentRpcListDetail, [{ rpcUrl: 'rpc_url', chainId: 1, ticker: 'ETH', nickname: '', rpcPrefs: {} }])
       preferencesController.addToFrequentRpcList('rpc_url', 1)
-      assert.deepEqual(preferencesController.store.getState().frequentRpcListDetail, [{ rpcUrl: 'rpc_url', chainId: 1, ticker: 'ETH', nickname: '' }])
+      assert.deepEqual(preferencesController.store.getState().frequentRpcListDetail, [{ rpcUrl: 'rpc_url', chainId: 1, ticker: 'ETH', nickname: '', rpcPrefs: {} }])
     })
 
     it('should remove custom RPC url from state', function () {
       preferencesController.addToFrequentRpcList('rpc_url', 1)
-      assert.deepEqual(preferencesController.store.getState().frequentRpcListDetail, [{ rpcUrl: 'rpc_url', chainId: 1, ticker: 'ETH', nickname: '' }])
+      assert.deepEqual(preferencesController.store.getState().frequentRpcListDetail, [{ rpcUrl: 'rpc_url', chainId: 1, ticker: 'ETH', nickname: '', rpcPrefs: {} }])
       preferencesController.removeFromFrequentRpcList('other_rpc_url')
       preferencesController.removeFromFrequentRpcList('http://localhost:8545')
       preferencesController.removeFromFrequentRpcList('rpc_url')
diff --git a/ui/app/components/app/dropdowns/account-details-dropdown.js b/ui/app/components/app/dropdowns/account-details-dropdown.js
index 3d4598946..cbeccdd81 100644
--- a/ui/app/components/app/dropdowns/account-details-dropdown.js
+++ b/ui/app/components/app/dropdowns/account-details-dropdown.js
@@ -4,7 +4,7 @@ const h = require('react-hyperscript')
 const inherits = require('util').inherits
 const connect = require('react-redux').connect
 const actions = require('../../../store/actions')
-const { getSelectedIdentity } = require('../../../selectors/selectors')
+const { getSelectedIdentity, getRpcPrefsForCurrentProvider } = require('../../../selectors/selectors')
 const genAccountLink = require('../../../../lib/account-link.js')
 const { Menu, Item, CloseArea } = require('./components/menu')
 
@@ -20,6 +20,7 @@ function mapStateToProps (state) {
     selectedIdentity: getSelectedIdentity(state),
     network: state.metamask.network,
     keyrings: state.metamask.keyrings,
+    rpcPrefs: getRpcPrefsForCurrentProvider(state),
   }
 }
 
@@ -28,8 +29,8 @@ function mapDispatchToProps (dispatch) {
     showAccountDetailModal: () => {
       dispatch(actions.showModal({ name: 'ACCOUNT_DETAILS' }))
     },
-    viewOnEtherscan: (address, network) => {
-      global.platform.openWindow({ url: genAccountLink(address, network) })
+    viewOnEtherscan: (address, network, rpcPrefs) => {
+      global.platform.openWindow({ url: genAccountLink(address, network, rpcPrefs) })
     },
     showRemoveAccountConfirmationModal: (identity) => {
       return dispatch(actions.showModal({ name: 'CONFIRM_REMOVE_ACCOUNT', identity }))
@@ -56,7 +57,9 @@ AccountDetailsDropdown.prototype.render = function () {
     keyrings,
     showAccountDetailModal,
     viewOnEtherscan,
-    showRemoveAccountConfirmationModal } = this.props
+    showRemoveAccountConfirmationModal,
+    rpcPrefs,
+   } = this.props
 
   const address = selectedIdentity.address
 
@@ -112,10 +115,12 @@ AccountDetailsDropdown.prototype.render = function () {
             name: 'Clicked View on Etherscan',
           },
         })
-        viewOnEtherscan(address, network)
+        viewOnEtherscan(address, network, rpcPrefs)
         this.props.onClose()
       },
-      text: this.context.t('viewOnEtherscan'),
+      text: (rpcPrefs.blockExplorerUrl
+        ? this.context.t('blockExplorerView', [rpcPrefs.blockExplorerUrl.match(/^https?:\/\/(.+)/)[1]])
+        : this.context.t('viewOnEtherscan')),
       icon: h(`img`, { src: 'images/open-etherscan.svg', style: { height: '15px' } }),
     }),
     isRemovable ? h(Item, {
diff --git a/ui/app/components/app/dropdowns/network-dropdown.js b/ui/app/components/app/dropdowns/network-dropdown.js
index dbe3f1bc8..378ad3ba6 100644
--- a/ui/app/components/app/dropdowns/network-dropdown.js
+++ b/ui/app/components/app/dropdowns/network-dropdown.js
@@ -10,7 +10,7 @@ const Dropdown = require('./components/dropdown').Dropdown
 const DropdownMenuItem = require('./components/dropdown').DropdownMenuItem
 const NetworkDropdownIcon = require('./components/network-dropdown-icon')
 const R = require('ramda')
-const { ADVANCED_ROUTE } = require('../../../helpers/constants/routes')
+const { NETWORKS_ROUTE } = require('../../../helpers/constants/routes')
 
 // classes from nodes of the toggle element.
 const notToggleElementClassnames = [
@@ -49,6 +49,7 @@ function mapDispatchToProps (dispatch) {
     },
     showNetworkDropdown: () => dispatch(actions.showNetworkDropdown()),
     hideNetworkDropdown: () => dispatch(actions.hideNetworkDropdown()),
+    setNetworksTabAddMode: isInAddMode => dispatch(actions.setNetworksTabAddMode(isInAddMode)),
   }
 }
 
@@ -72,7 +73,7 @@ module.exports = compose(
 // TODO: specify default props and proptypes
 NetworkDropdown.prototype.render = function () {
   const props = this.props
-  const { provider: { type: providerType, rpcTarget: activeNetwork } } = props
+  const { provider: { type: providerType, rpcTarget: activeNetwork }, setNetworksTabAddMode } = props
   const rpcListDetail = props.frequentRpcListDetail
   const isOpen = this.props.networkDropdownOpen
   const dropdownMenuItemStyle = {
@@ -255,7 +256,10 @@ NetworkDropdown.prototype.render = function () {
       DropdownMenuItem,
       {
         closeMenu: () => this.props.hideNetworkDropdown(),
-        onClick: () => this.props.history.push(ADVANCED_ROUTE),
+        onClick: () => {
+          setNetworksTabAddMode(true)
+          this.props.history.push(NETWORKS_ROUTE)
+        },
         style: dropdownMenuItemStyle,
       },
       [
diff --git a/ui/app/components/app/modals/account-details-modal.js b/ui/app/components/app/modals/account-details-modal.js
index 1b1ca6b8e..6cffc918b 100644
--- a/ui/app/components/app/modals/account-details-modal.js
+++ b/ui/app/components/app/modals/account-details-modal.js
@@ -5,7 +5,7 @@ const inherits = require('util').inherits
 const connect = require('react-redux').connect
 const actions = require('../../../store/actions')
 const AccountModalContainer = require('./account-modal-container')
-const { getSelectedIdentity } = require('../../../selectors/selectors')
+const { getSelectedIdentity, getRpcPrefsForCurrentProvider } = require('../../../selectors/selectors')
 const genAccountLink = require('../../../../lib/account-link.js')
 const QrView = require('../../ui/qr-code')
 const EditableLabel = require('../../ui/editable-label')
@@ -17,6 +17,7 @@ function mapStateToProps (state) {
     network: state.metamask.network,
     selectedIdentity: getSelectedIdentity(state),
     keyrings: state.metamask.keyrings,
+    rpcPrefs: getRpcPrefsForCurrentProvider(state),
   }
 }
 
@@ -54,6 +55,7 @@ AccountDetailsModal.prototype.render = function () {
     showExportPrivateKeyModal,
     setAccountLabel,
     keyrings,
+    rpcPrefs,
   } = this.props
   const { name, address } = selectedIdentity
 
@@ -86,8 +88,12 @@ AccountDetailsModal.prototype.render = function () {
       h(Button, {
         type: 'secondary',
         className: 'account-modal__button',
-        onClick: () => global.platform.openWindow({ url: genAccountLink(address, network) }),
-      }, this.context.t('etherscanView')),
+        onClick: () => {
+          global.platform.openWindow({ url: genAccountLink(address, network, rpcPrefs) })
+        },
+      }, (rpcPrefs.blockExplorerUrl
+        ? this.context.t('blockExplorerView', [rpcPrefs.blockExplorerUrl.match(/^https?:\/\/(.+)/)[1]])
+        : this.context.t('viewOnEtherscan'))),
 
       // Holding on redesign for Export Private Key functionality
 
diff --git a/ui/app/components/app/transaction-list-item-details/transaction-list-item-details.component.js b/ui/app/components/app/transaction-list-item-details/transaction-list-item-details.component.js
index 4a3b04998..72ca784e2 100644
--- a/ui/app/components/app/transaction-list-item-details/transaction-list-item-details.component.js
+++ b/ui/app/components/app/transaction-list-item-details/transaction-list-item-details.component.js
@@ -1,13 +1,15 @@
 import React, { PureComponent } from 'react'
 import PropTypes from 'prop-types'
 import copyToClipboard from 'copy-to-clipboard'
+import {
+  getBlockExplorerUrlForTx,
+} from '../../../helpers/utils/transactions.util'
 import SenderToRecipient from '../../ui/sender-to-recipient'
 import { FLAT_VARIANT } from '../../ui/sender-to-recipient/sender-to-recipient.constants'
 import TransactionActivityLog from '../transaction-activity-log'
 import TransactionBreakdown from '../transaction-breakdown'
 import Button from '../../ui/button'
 import Tooltip from '../../ui/tooltip'
-import prefixForNetwork from '../../../../lib/etherscan-prefix-for-network'
 
 export default class TransactionListItemDetails extends PureComponent {
   static contextTypes = {
@@ -22,6 +24,7 @@ export default class TransactionListItemDetails extends PureComponent {
     showRetry: PropTypes.bool,
     cancelDisabled: PropTypes.bool,
     transactionGroup: PropTypes.object,
+    rpcPrefs: PropTypes.object,
   }
 
   state = {
@@ -30,12 +33,9 @@ export default class TransactionListItemDetails extends PureComponent {
   }
 
   handleEtherscanClick = () => {
-    const { transactionGroup: { primaryTransaction } } = this.props
+    const { transactionGroup: { primaryTransaction }, rpcPrefs } = this.props
     const { hash, metamaskNetworkId } = primaryTransaction
 
-    const prefix = prefixForNetwork(metamaskNetworkId)
-    const etherscanUrl = `https://${prefix}etherscan.io/tx/${hash}`
-
     this.context.metricsEvent({
       eventOpts: {
         category: 'Navigation',
@@ -44,7 +44,7 @@ export default class TransactionListItemDetails extends PureComponent {
       },
     })
 
-    global.platform.openWindow({ url: etherscanUrl })
+    global.platform.openWindow({ url: getBlockExplorerUrlForTx(metamaskNetworkId, hash, rpcPrefs) })
   }
 
   handleCancel = event => {
@@ -125,6 +125,7 @@ export default class TransactionListItemDetails extends PureComponent {
       showRetry,
       onCancel,
       onRetry,
+      rpcPrefs: { blockExplorerUrl } = {},
     } = this.props
     const { primaryTransaction: transaction } = transactionGroup
     const { txParams: { to, from } = {} } = transaction
@@ -158,7 +159,7 @@ export default class TransactionListItemDetails extends PureComponent {
                 />
               </Button>
             </Tooltip>
-            <Tooltip title={t('viewOnEtherscan')}>
+            <Tooltip title={blockExplorerUrl ? t('viewOnCustomBlockExplorer', [blockExplorerUrl]) : t('viewOnEtherscan')}>
               <Button
                 type="raised"
                 onClick={this.handleEtherscanClick}
diff --git a/ui/app/components/app/transaction-list-item/transaction-list-item.component.js b/ui/app/components/app/transaction-list-item/transaction-list-item.component.js
index c7d9dd7c7..0d4127b4f 100644
--- a/ui/app/components/app/transaction-list-item/transaction-list-item.component.js
+++ b/ui/app/components/app/transaction-list-item/transaction-list-item.component.js
@@ -33,6 +33,7 @@ export default class TransactionListItem extends PureComponent {
     value: PropTypes.string,
     fetchBasicGasAndTimeEstimates: PropTypes.func,
     fetchGasEstimates: PropTypes.func,
+    rpcPrefs: PropTypes.object,
   }
 
   static defaultProps = {
@@ -161,6 +162,7 @@ export default class TransactionListItem extends PureComponent {
       showRetry,
       tokenData,
       transactionGroup,
+      rpcPrefs,
     } = this.props
     const { txParams = {} } = transaction
     const { showTransactionDetails } = this.state
@@ -216,6 +218,7 @@ export default class TransactionListItem extends PureComponent {
                   onCancel={this.handleCancel}
                   showCancel={showCancel}
                   cancelDisabled={!hasEnoughCancelGas}
+                  rpcPrefs={rpcPrefs}
                 />
               </div>
             )
diff --git a/ui/app/components/app/transaction-list-item/transaction-list-item.container.js b/ui/app/components/app/transaction-list-item/transaction-list-item.container.js
index a8fb8c246..5e88a2937 100644
--- a/ui/app/components/app/transaction-list-item/transaction-list-item.container.js
+++ b/ui/app/components/app/transaction-list-item/transaction-list-item.container.js
@@ -18,12 +18,14 @@ import { getIsMainnet, preferencesSelector, getSelectedAddress, conversionRateSe
 import { isBalanceSufficient } from '../../../pages/send/send.utils'
 
 const mapStateToProps = (state, ownProps) => {
-  const { metamask: { knownMethodData, accounts } } = state
+  const { metamask: { knownMethodData, accounts, provider, frequentRpcListDetail } } = state
   const { showFiatInTestnets } = preferencesSelector(state)
   const isMainnet = getIsMainnet(state)
   const { transactionGroup: { primaryTransaction } = {} } = ownProps
   const { txParams: { gas: gasLimit, gasPrice } = {} } = primaryTransaction
   const selectedAccountBalance = accounts[getSelectedAddress(state)].balance
+  const selectRpcInfo = frequentRpcListDetail.find(rpcInfo => rpcInfo.rpcUrl === provider.rpcTarget)
+  const { rpcPrefs } = selectRpcInfo || {}
 
   const hasEnoughCancelGas = primaryTransaction.txParams && isBalanceSufficient({
     amount: '0x0',
@@ -40,6 +42,7 @@ const mapStateToProps = (state, ownProps) => {
     showFiat: (isMainnet || !!showFiatInTestnets),
     selectedAccountBalance,
     hasEnoughCancelGas,
+    rpcPrefs,
   }
 }
 
diff --git a/ui/app/components/ui/text-field/text-field.component.js b/ui/app/components/ui/text-field/text-field.component.js
index 2c72d8124..1153a595b 100644
--- a/ui/app/components/ui/text-field/text-field.component.js
+++ b/ui/app/components/ui/text-field/text-field.component.js
@@ -41,11 +41,11 @@ const styles = {
   inputFocused: {},
   inputRoot: {
     'label + &': {
-      marginTop: '8px',
+      marginTop: '9px',
     },
-    border: '1px solid #d2d8dd',
+    border: '2px solid #BBC0C5',
     height: '48px',
-    borderRadius: '4px',
+    borderRadius: '6px',
     padding: '0 16px',
     display: 'flex',
     alignItems: 'center',
diff --git a/ui/app/ducks/app/app.js b/ui/app/ducks/app/app.js
index 295507d70..b181092c1 100644
--- a/ui/app/ducks/app/app.js
+++ b/ui/app/ducks/app/app.js
@@ -77,6 +77,8 @@ function reduceApp (state, action) {
       ledger: `m/44'/60'/0'/0/0`,
     },
     lastSelectedProvider: null,
+    networksTabSelectedRpcUrl: '',
+    networksTabIsInAddMode: false,
   }, state.appState)
 
   switch (action.type) {
@@ -751,6 +753,16 @@ function reduceApp (state, action) {
         lastSelectedProvider: action.value,
       })
 
+    case actions.SET_SELECTED_SETTINGS_RPC_URL:
+      return extend(appState, {
+        networksTabSelectedRpcUrl: action.value,
+      })
+
+    case actions.SET_NETWORKS_TAB_ADD_MODE:
+      return extend(appState, {
+        networksTabIsInAddMode: action.value,
+      })
+
     default:
       return appState
   }
diff --git a/ui/app/helpers/constants/routes.js b/ui/app/helpers/constants/routes.js
index df35112d1..d906fc8e6 100644
--- a/ui/app/helpers/constants/routes.js
+++ b/ui/app/helpers/constants/routes.js
@@ -8,6 +8,7 @@ const ADVANCED_ROUTE = '/settings/advanced'
 const SECURITY_ROUTE = '/settings/security'
 const COMPANY_ROUTE = '/settings/company'
 const ABOUT_US_ROUTE = '/settings/about-us'
+const NETWORKS_ROUTE = '/settings/networks'
 const REVEAL_SEED_ROUTE = '/seed'
 const MOBILE_SYNC_ROUTE = '/mobile-sync'
 const CONFIRM_SEED_ROUTE = '/confirm-seed'
@@ -86,4 +87,5 @@ module.exports = {
   COMPANY_ROUTE,
   GENERAL_ROUTE,
   ABOUT_US_ROUTE,
+  NETWORKS_ROUTE,
 }
diff --git a/ui/app/helpers/utils/transactions.util.js b/ui/app/helpers/utils/transactions.util.js
index cb6c9536c..99ccc3478 100644
--- a/ui/app/helpers/utils/transactions.util.js
+++ b/ui/app/helpers/utils/transactions.util.js
@@ -6,6 +6,8 @@ import {
   TRANSACTION_TYPE_CANCEL,
   TRANSACTION_STATUS_CONFIRMED,
 } from '../../../../app/scripts/controllers/transactions/enums'
+import prefixForNetwork from '../../../lib/etherscan-prefix-for-network'
+
 
 import {
   TOKEN_METHOD_TRANSFER,
@@ -188,3 +190,17 @@ export function getStatusKey (transaction) {
 
   return transaction.status
 }
+
+/**
+ * Returns an external block explorer URL at which a transaction can be viewed.
+ * @param {number} networkId
+ * @param {string} hash
+ * @param {Object} rpcPrefs
+ */
+export function getBlockExplorerUrlForTx (networkId, hash, rpcPrefs = {}) {
+  if (rpcPrefs.blockExplorerUrl) {
+    return `${rpcPrefs.blockExplorerUrl}/tx/${hash}`
+  }
+  const prefix = prefixForNetwork(networkId)
+  return `https://${prefix}etherscan.io/tx/${hash}`
+}
diff --git a/ui/app/pages/settings/index.scss b/ui/app/pages/settings/index.scss
index a19105bb4..66959ba93 100644
--- a/ui/app/pages/settings/index.scss
+++ b/ui/app/pages/settings/index.scss
@@ -1,5 +1,7 @@
 @import 'info-tab/index';
 
+@import 'networks-tab/index';
+
 @import 'settings-tab/index';
 
 .settings-page {
@@ -13,7 +15,6 @@
     flex-flow: row nowrap;
     padding: 12px 24px;
     align-items: center;
-    border-bottom: 1px solid $alto;
     flex: 0 0 auto;
 
     &__title {
@@ -33,6 +34,34 @@
     }
   }
 
+  &__sub-header {
+    height: 72px;
+    border-bottom: 1px solid #D8D8D8;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+
+    @media screen and (max-width: 575px) {
+      height: 69px;
+      position: relative;
+      text-align: center;
+    }
+  }
+
+  &__sub-header-text {
+    font-family: Roboto;
+    font-style: normal;
+    font-weight: normal;
+    font-size: 24px;
+    line-height: 24px;
+    color: black;
+
+    @media screen and (max-width: 575px) {
+      font-size: 16px;
+      width: 100%;
+    }
+  }
+
   &__back-button {
     display: none;
 
@@ -60,8 +89,9 @@
   &__content {
     display: flex;
     flex-flow: row nowrap;
-    height: auto;
+    height: 100%;
     overflow: auto;
+    border-top: 1px solid #D8D8D8;
 
     &__tabs {
       display: flex;
@@ -93,7 +123,7 @@
 
   &__body {
     padding: 12px 24px;
-
+    
     @media screen and (min-width: 576px) {
       padding: 12px;
     }
diff --git a/ui/app/pages/settings/networks-tab/index.js b/ui/app/pages/settings/networks-tab/index.js
new file mode 100644
index 000000000..362004498
--- /dev/null
+++ b/ui/app/pages/settings/networks-tab/index.js
@@ -0,0 +1 @@
+export { default } from './networks-tab.container'
diff --git a/ui/app/pages/settings/networks-tab/index.scss b/ui/app/pages/settings/networks-tab/index.scss
new file mode 100644
index 000000000..b0020437d
--- /dev/null
+++ b/ui/app/pages/settings/networks-tab/index.scss
@@ -0,0 +1,200 @@
+.networks-tab {
+  &__content {
+    margin-top: 24px;
+    display: flex;
+    height: 100%;
+    max-width: 739px;
+    justify-content: space-between;
+
+    @media screen and (max-width: 575px) {
+      margin-top: 0px;
+    }
+  }
+
+  &__body {
+    padding: 12px 24px;
+    height: 100%;
+    display: flex;
+    flex-direction: column;
+
+    @media screen and (max-width: 575px) {
+      padding: 0;
+    }
+  }
+
+  &__back-button {
+    display: none;
+
+    @media screen and (max-width: 575px) {
+      display: block;
+      background-image: url('/images/caret-left-black.svg');
+      width: 18px;
+      height: 18px;
+      opacity: .5;
+      background-size: contain;
+      background-repeat: no-repeat;
+      background-position: center;
+      margin-right: 16px;
+      cursor: pointer;
+      position: absolute;
+      margin-left: 10px;
+    }
+  }
+
+  &__network-form {
+    flex: 0.5 0 auto;
+    max-width: 343px;
+    max-height: 465px;
+    display: flex;
+    flex-direction: column;
+    justify-content: space-between;
+
+    .page-container__footer {
+      border-top: none;
+
+      @media screen and (max-width: 575px) {
+        width: 93%;
+      }
+
+      header {
+        padding: 10px 0px;
+      }
+    }
+
+    @media screen and (max-width: 575px) {
+      display: flex;
+      flex: auto;
+      max-width: 100%;
+      max-height: 100%;
+      align-items: center;
+      width: 100%;
+      margin-top: 10px;
+    }
+  }
+
+  &__network-form-row {
+    @media screen and (max-width: 575px) {
+      display: flex;
+      flex-direction: column;
+      width: 93%;
+    }
+  }
+
+  &__network-form-label {
+    font-family: Roboto;
+    font-style: normal;
+    font-weight: normal;
+    font-size: 14px;
+    line-height: 20px;
+    color: #000000;
+  }
+
+  &__networks-list {
+    flex: 0.5 0 auto;
+    max-width: 343px;
+
+    @media screen and (max-width: 575px) {
+      max-width: 100vw;
+      width: 100vw;
+      overflow-y: scroll;
+    }
+  }
+
+  &__add-network-button-wrapper {
+    display: none;
+
+    @media screen and (max-width: 575px) {
+      display: flex;
+      padding-top: 19px;
+      padding-bottom: 23px;
+      justify-content: center;
+      align-items: center;
+      border-top: 1px solid #D8D8D8;
+
+      .button {
+        width: 178px;
+      }
+    }
+  }
+
+  &__add-network-header-button-wrapper {
+    padding-top: 15px;
+    padding-bottom: 21px;
+    justify-content: center;
+
+    .button {
+      width: 178px;
+    }
+
+    @media screen and (max-width: 575px) {
+      display: none;
+    }
+  }
+
+  &__networks-list--selection {
+    @media screen and (max-width: 575px) {
+      display: none;
+    }
+  }
+
+  &__networks-list-item {
+    display: flex;
+    padding: 13px 0px 13px 17px;
+    position: relative;
+
+    .menu-icon-circle {
+      &:hover {
+        cursor: pointer;
+      }
+    }
+
+    @media screen and (max-width: 575px) {
+      padding: 20px 23px 21px 17px;
+      border-bottom: 1px solid #D8D8D8;
+    }
+  }
+
+  &__networks-list-item:last-of-type {
+    @media screen and (max-width: 575px) {
+      border-bottom: none;
+    }
+  }
+
+  &__networks-list-name {
+    margin-left: 11px;
+    font-family: Roboto;
+    font-style: normal;
+    font-weight: normal;
+    font-size: 16px;
+    line-height: 23px;
+    color: #6A737D;
+
+    &:hover {
+      cursor: pointer;
+    }
+  }
+
+  &__networks-list-arrow {
+    display: none;
+
+    @media screen and (max-width: 575px) {
+      display: block;
+      background-image: url('/images/caret-right.svg');
+      width: 24px;
+      height: 24px;
+      background-size: contain;
+      background-repeat: no-repeat;
+      background-position: center;
+      right: 10px;
+      cursor: pointer;
+      position: absolute;
+      width: 24px;
+      height: 24px;
+    }
+  }
+
+  &__networks-list-name--selected {
+    font-weight: bold;
+    color: #000000;
+  }
+}
\ No newline at end of file
diff --git a/ui/app/pages/settings/networks-tab/network-form/index.js b/ui/app/pages/settings/networks-tab/network-form/index.js
new file mode 100644
index 000000000..89d9de42b
--- /dev/null
+++ b/ui/app/pages/settings/networks-tab/network-form/index.js
@@ -0,0 +1 @@
+export { default } from './network-form.component'
diff --git a/ui/app/pages/settings/networks-tab/network-form/network-form.component.js b/ui/app/pages/settings/networks-tab/network-form/network-form.component.js
new file mode 100644
index 000000000..5e455b65e
--- /dev/null
+++ b/ui/app/pages/settings/networks-tab/network-form/network-form.component.js
@@ -0,0 +1,225 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import validUrl from 'valid-url'
+import PageContainerFooter from '../../../../components/ui/page-container/page-container-footer'
+import TextField from '../../../../components/ui/text-field'
+
+export default class NetworksTab extends PureComponent {
+  static contextTypes = {
+    t: PropTypes.func.isRequired,
+    metricsEvent: PropTypes.func.isRequired,
+  }
+
+  static propTypes = {
+    editRpc: PropTypes.func.isRequired,
+    rpcUrl: PropTypes.string,
+    chainId: PropTypes.string,
+    ticker: PropTypes.string,
+    viewOnly: PropTypes.bool,
+    networkName: PropTypes.string,
+    onClear: PropTypes.func.isRequired,
+    setRpcTarget: PropTypes.func.isRequired,
+    networksTabIsInAddMode: PropTypes.bool,
+    blockExplorerUrl: PropTypes.string,
+    rpcPrefs: PropTypes.object,
+  }
+
+  state = {
+    rpcUrl: this.props.rpcUrl,
+    chainId: this.props.chainId,
+    ticker: this.props.ticker,
+    networkName: this.props.networkName,
+    blockExplorerUrl: this.props.blockExplorerUrl,
+    errors: {},
+  }
+
+  componentDidUpdate (prevProps) {
+    const { rpcUrl: prevRpcUrl, networksTabIsInAddMode: prevAddMode } = prevProps
+    const {
+      rpcUrl,
+      chainId,
+      ticker,
+      networkName,
+      networksTabIsInAddMode,
+      blockExplorerUrl,
+    } = this.props
+
+    if (!prevAddMode && networksTabIsInAddMode) {
+      this.setState({
+        rpcUrl: '',
+        chainId: '',
+        ticker: '',
+        networkName: '',
+        blockExplorerUrl: '',
+        errors: {},
+      })
+    } else if (prevRpcUrl !== rpcUrl) {
+      this.setState({ rpcUrl, chainId, ticker, networkName, blockExplorerUrl, errors: {} })
+    }
+  }
+
+  componentWillUnmount () {
+    this.props.onClear()
+    this.setState({
+      rpcUrl: '',
+      chainId: '',
+      ticker: '',
+      networkName: '',
+      blockExplorerUrl: '',
+      errors: {},
+    })
+  }
+
+  stateIsUnchanged () {
+    const {
+      rpcUrl,
+      chainId,
+      ticker,
+      networkName,
+      blockExplorerUrl,
+    } = this.props
+
+    const {
+      rpcUrl: stateRpcUrl,
+      chainId: stateChainId,
+      ticker: stateTicker,
+      networkName: stateNetworkName,
+      blockExplorerUrl: stateBlockExplorerUrl,
+    } = this.state
+
+    return (
+      stateRpcUrl === rpcUrl &&
+      stateChainId === chainId &&
+      stateTicker === ticker &&
+      stateNetworkName === networkName &&
+      stateBlockExplorerUrl === blockExplorerUrl
+    )
+  }
+
+  renderFormTextField (fieldKey, textFieldId, onChange, value, optionalTextFieldKey) {
+    const { errors } = this.state
+    const { viewOnly } = this.props
+
+    return (
+      <div className="networks-tab__network-form-row">
+        <div className="networks-tab__network-form-label">{this.context.t(optionalTextFieldKey || fieldKey)}</div>
+        <TextField
+          type="text"
+          id={textFieldId}
+          onChange={onChange}
+          fullWidth
+          margin="dense"
+          value={value}
+          disabled={viewOnly}
+          error={errors[fieldKey]}
+        />
+      </div>
+    )
+  }
+
+  setStateWithValue = (stateKey, validator) => {
+    return (e) => {
+      validator && validator(e.target.value, stateKey)
+      this.setState({ [stateKey]: e.target.value })
+    }
+  }
+
+  setErrorTo = (errorKey, errorVal) => {
+    this.setState({
+      errors: {
+        ...this.state.errors,
+        [errorKey]: errorVal,
+      },
+    })
+  }
+
+  validateChainId = (chainId) => {
+    this.setErrorTo('chainId', !!chainId && Number.isNaN(parseInt(chainId))
+      ? `${this.context.t('invalidInput')} chainId`
+      : ''
+    )
+  }
+
+  validateUrl = (url, stateKey) => {
+    if (validUrl.isWebUri(url)) {
+      this.setErrorTo(stateKey, '')
+    } else {
+      const appendedRpc = `http://${url}`
+      const validWhenAppended = validUrl.isWebUri(appendedRpc) && !url.match(/^https?:\/\/$/)
+
+      this.setErrorTo(stateKey, this.context.t(validWhenAppended ? 'uriErrorMsg' : 'invalidRPC'))
+    }
+  }
+
+  render () {
+    const { setRpcTarget, viewOnly, rpcUrl: propsRpcUrl, editRpc, rpcPrefs = {} } = this.props
+    const {
+      networkName,
+      rpcUrl,
+      chainId,
+      ticker,
+      blockExplorerUrl,
+      errors,
+    } = this.state
+
+
+    return (
+      <div className="networks-tab__network-form">
+        {this.renderFormTextField(
+          'networkName',
+          'network-name',
+          this.setStateWithValue('networkName'),
+          networkName,
+        )}
+        {this.renderFormTextField(
+          'rpcUrl',
+          'rpc-url',
+          this.setStateWithValue('rpcUrl', this.validateUrl),
+          rpcUrl,
+        )}
+        {this.renderFormTextField(
+          'chainId',
+          'chainId',
+          this.setStateWithValue('chainId', this.validateChainId),
+          chainId,
+          'optionalChainId',
+        )}
+        {this.renderFormTextField(
+          'symbol',
+          'network-ticker',
+          this.setStateWithValue('ticker'),
+          ticker,
+          'optionalSymbol',
+        )}
+        {this.renderFormTextField(
+          'blockExplorerUrl',
+          'block-explorer-url',
+          this.setStateWithValue('blockExplorerUrl', this.validateUrl),
+          blockExplorerUrl,
+          'optionalBlockExplorerUrl',
+        )}
+        <PageContainerFooter
+          cancelText={this.context.t('cancel')}
+          hideCancel={true}
+          onSubmit={() => {
+            if (propsRpcUrl && rpcUrl !== propsRpcUrl) {
+              editRpc(propsRpcUrl, rpcUrl, chainId, ticker, networkName, {
+                blockExplorerUrl: blockExplorerUrl || rpcPrefs.blockExplorerUrl,
+                ...rpcPrefs,
+              })
+            } else {
+              setRpcTarget(rpcUrl, chainId, ticker, networkName, {
+                blockExplorerUrl: blockExplorerUrl || rpcPrefs.blockExplorerUrl,
+                ...rpcPrefs,
+              })
+            }
+          }}
+          submitText={this.context.t('save')}
+          submitButtonType={'confirm'}
+          disabled={viewOnly || this.stateIsUnchanged() || Object.values(errors).some(x => x) || !rpcUrl}
+        />
+      </div>
+    )
+  }
+
+}
diff --git a/ui/app/pages/settings/networks-tab/networks-tab.component.js b/ui/app/pages/settings/networks-tab/networks-tab.component.js
new file mode 100644
index 000000000..2f921a892
--- /dev/null
+++ b/ui/app/pages/settings/networks-tab/networks-tab.component.js
@@ -0,0 +1,214 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import { SETTINGS_ROUTE } from '../../../helpers/constants/routes'
+import { ENVIRONMENT_TYPE_POPUP } from '../../../../../app/scripts/lib/enums'
+import { getEnvironmentType } from '../../../../../app/scripts/lib/util'
+import classnames from 'classnames'
+import Button from '../../../components/ui/button'
+import NetworkForm from './network-form'
+import NetworkDropdownIcon from '../../../components/app/dropdowns/components/network-dropdown-icon'
+
+export default class NetworksTab extends PureComponent {
+  static contextTypes = {
+    t: PropTypes.func.isRequired,
+    metricsEvent: PropTypes.func.isRequired,
+  }
+
+  static propTypes = {
+    editRpc: PropTypes.func.isRequired,
+    history: PropTypes.object.isRequired,
+    location: PropTypes.object.isRequired,
+    networkIsSelected: PropTypes.bool,
+    networksTabIsInAddMode: PropTypes.bool,
+    networksToRender: PropTypes.array.isRequired,
+    selectedNetwork: PropTypes.object,
+    setNetworksTabAddMode: PropTypes.func.isRequired,
+    setRpcTarget: PropTypes.func.isRequired,
+    setSelectedSettingsRpcUrl: PropTypes.func.isRequired,
+    providerUrl: PropTypes.string,
+    providerType: PropTypes.string,
+    networkDefaultedToProvider: PropTypes.bool,
+  }
+
+  componentWillMount () {
+    this.props.setSelectedSettingsRpcUrl(null)
+  }
+
+  isCurrentPath (pathname) {
+    return this.props.location.pathname === pathname
+  }
+
+  renderSubHeader () {
+    const {
+      networkIsSelected,
+      setSelectedSettingsRpcUrl,
+      setNetworksTabAddMode,
+      networksTabIsInAddMode,
+      networkDefaultedToProvider,
+    } = this.props
+
+    return (
+      <div className="settings-page__sub-header">
+          <div
+            className="networks-tab__back-button"
+            onClick={(networkIsSelected && !networkDefaultedToProvider) || networksTabIsInAddMode
+              ? () => {
+                  setNetworksTabAddMode(false)
+                  setSelectedSettingsRpcUrl(null)
+                }
+              : () => this.props.history.push(SETTINGS_ROUTE)
+            }
+          />
+        <span className="settings-page__sub-header-text">{ this.context.t('networks') }</span>
+        <div className="networks-tab__add-network-header-button-wrapper">
+          <Button
+            type="primary"
+            onClick={event => {
+              event.preventDefault()
+              setSelectedSettingsRpcUrl(null)
+              setNetworksTabAddMode(true)
+            }}
+          >
+            { this.context.t('addNetwork') }
+          </Button>
+        </div>
+      </div>
+    )
+  }
+
+  renderNetworkListItem (network, selectRpcUrl) {
+    const {
+      setSelectedSettingsRpcUrl,
+      setNetworksTabAddMode,
+      networkIsSelected,
+      providerUrl,
+      providerType,
+      networksTabIsInAddMode,
+    } = this.props
+    const {
+      border,
+      iconColor,
+      label,
+      labelKey,
+      rpcUrl,
+      providerType: currentProviderType,
+    } = network
+
+    const listItemNetworkIsSelected = selectRpcUrl && selectRpcUrl === rpcUrl
+    const listItemUrlIsProviderUrl = rpcUrl === providerUrl
+    const listItemTypeIsProviderNonRpcType = providerType !== 'rpc' && currentProviderType === providerType
+    const listItemNetworkIsCurrentProvider = !networkIsSelected && !networksTabIsInAddMode && (listItemUrlIsProviderUrl || listItemTypeIsProviderNonRpcType)
+    const displayNetworkListItemAsSelected = listItemNetworkIsSelected || listItemNetworkIsCurrentProvider
+
+    return (
+      <div
+        key={'settings-network-list-item:' + rpcUrl}
+        className="networks-tab__networks-list-item"
+        onClick={ () => {
+          setNetworksTabAddMode(false)
+          setSelectedSettingsRpcUrl(rpcUrl)
+        }}
+       >
+        <NetworkDropdownIcon
+          backgroundColor={iconColor || 'white'}
+          innerBorder={border}
+        />
+        <div className={ classnames('networks-tab__networks-list-name', {
+          'networks-tab__networks-list-name--selected': displayNetworkListItemAsSelected,
+        }) }>
+          { label || this.context.t(labelKey) }
+        </div>
+        <div className="networks-tab__networks-list-arrow" />
+      </div>
+    )
+  }
+
+  renderNetworksList () {
+    const { networksToRender, selectedNetwork, networkIsSelected, networksTabIsInAddMode, networkDefaultedToProvider } = this.props
+
+    return (
+      <div className={classnames('networks-tab__networks-list', {
+        'networks-tab__networks-list--selection': (networkIsSelected && !networkDefaultedToProvider) || networksTabIsInAddMode,
+      })}>
+        { networksToRender.map(network => this.renderNetworkListItem(network, selectedNetwork.rpcUrl)) }
+      </div>
+    )
+  }
+
+  renderNetworksTabContent () {
+    const {
+      setRpcTarget,
+      setSelectedSettingsRpcUrl,
+      setNetworksTabAddMode,
+      selectedNetwork: {
+        labelKey,
+        label,
+        rpcUrl,
+        chainId,
+        ticker,
+        viewOnly,
+        rpcPrefs,
+        blockExplorerUrl,
+      },
+      networksTabIsInAddMode,
+      editRpc,
+      networkDefaultedToProvider,
+    } = this.props
+    const envIsPopup = getEnvironmentType() === ENVIRONMENT_TYPE_POPUP
+
+    return (
+      <div className="networks-tab__content">
+        {this.renderNetworksList()}
+        {networksTabIsInAddMode || !envIsPopup || (envIsPopup && !networkDefaultedToProvider)
+          ? <NetworkForm
+            setRpcTarget={setRpcTarget}
+            editRpc={editRpc}
+            networkName={label || labelKey && this.context.t(labelKey) || ''}
+            rpcUrl={rpcUrl}
+            chainId={chainId}
+            ticker={ticker}
+            onClear={() => {
+              setNetworksTabAddMode(false)
+              setSelectedSettingsRpcUrl(null)
+            }}
+            viewOnly={viewOnly}
+            networksTabIsInAddMode={networksTabIsInAddMode}
+            rpcPrefs={rpcPrefs}
+            blockExplorerUrl={blockExplorerUrl}
+          />
+          : null
+        }
+      </div>
+    )
+  }
+
+  renderContent () {
+    const { setNetworksTabAddMode, setSelectedSettingsRpcUrl, networkIsSelected, networksTabIsInAddMode } = this.props
+
+    return (
+      <div className="networks-tab__body">
+        {this.renderSubHeader()}
+        {this.renderNetworksTabContent()}
+        {!networkIsSelected && !networksTabIsInAddMode
+          ? <div className="networks-tab__add-network-button-wrapper">
+              <Button
+                type="primary"
+                onClick={event => {
+                  event.preventDefault()
+                  setSelectedSettingsRpcUrl(null)
+                  setNetworksTabAddMode(true)
+                }}
+              >
+                { this.context.t('addNetwork') }
+              </Button>
+          </div>
+          : null
+        }
+      </div>
+    )
+  }
+
+  render () {
+    return this.renderContent()
+  }
+}
diff --git a/ui/app/pages/settings/networks-tab/networks-tab.constants.js b/ui/app/pages/settings/networks-tab/networks-tab.constants.js
new file mode 100644
index 000000000..d3d1a01cc
--- /dev/null
+++ b/ui/app/pages/settings/networks-tab/networks-tab.constants.js
@@ -0,0 +1,50 @@
+const defaultNetworksData = [
+  {
+    labelKey: 'mainnet',
+    iconColor: '#29B6AF',
+    providerType: 'mainnet',
+    rpcUrl: 'https://api.infura.io/v1/jsonrpc/mainnet',
+    chainId: '1',
+    ticker: 'ETH',
+    blockExplorerUrl: 'https://etherscan.io',
+  },
+  {
+    labelKey: 'ropsten',
+    iconColor: '#FF4A8D',
+    providerType: 'ropsten',
+    rpcUrl: 'https://api.infura.io/v1/jsonrpc/ropsten',
+    chainId: '3',
+    ticker: 'ETH',
+    blockExplorerUrl: 'https://ropsten.etherscan.io',
+  },
+  {
+    labelKey: 'kovan',
+    iconColor: '#9064FF',
+    providerType: 'kovan',
+    rpcUrl: 'https://api.infura.io/v1/jsonrpc/kovan',
+    chainId: '4',
+    ticker: 'ETH',
+    blockExplorerUrl: 'https://etherscan.io',
+  },
+  {
+    labelKey: 'rinkeby',
+    iconColor: '#F6C343',
+    providerType: 'rinkeby',
+    rpcUrl: 'https://api.infura.io/v1/jsonrpc/rinkeby',
+    chainId: '42',
+    ticker: 'ETH',
+    blockExplorerUrl: 'https://rinkeby.etherscan.io',
+  },
+  {
+    labelKey: 'localhost',
+    iconColor: 'white',
+    border: '1px solid #6A737D',
+    providerType: 'localhost',
+    rpcUrl: 'http://localhost:8545/',
+    blockExplorerUrl: 'https://etherscan.io',
+  },
+]
+
+export {
+  defaultNetworksData,
+}
diff --git a/ui/app/pages/settings/networks-tab/networks-tab.container.js b/ui/app/pages/settings/networks-tab/networks-tab.container.js
new file mode 100644
index 000000000..a5d71f714
--- /dev/null
+++ b/ui/app/pages/settings/networks-tab/networks-tab.container.js
@@ -0,0 +1,77 @@
+import NetworksTab from './networks-tab.component'
+import { compose } from 'recompose'
+import { connect } from 'react-redux'
+import { withRouter } from 'react-router-dom'
+import {
+  setSelectedSettingsRpcUrl,
+  updateAndSetCustomRpc,
+  displayWarning,
+  setNetworksTabAddMode,
+  editRpc,
+} from '../../../store/actions'
+import { defaultNetworksData } from './networks-tab.constants'
+const defaultNetworks = defaultNetworksData.map(network => ({ ...network, viewOnly: true }))
+
+const mapStateToProps = state => {
+  const {
+    frequentRpcListDetail,
+    provider,
+  } = state.metamask
+  const {
+    networksTabSelectedRpcUrl,
+    networksTabIsInAddMode,
+  } = state.appState
+
+  const frequentRpcNetworkListDetails = frequentRpcListDetail.map(rpc => {
+    return {
+      label: rpc.nickname,
+      iconColor: '#6A737D',
+      providerType: 'rpc',
+      rpcUrl: rpc.rpcUrl,
+      chainId: rpc.chainId,
+      ticker: rpc.ticker,
+      blockExplorerUrl: rpc.rpcPrefs && rpc.rpcPrefs.blockExplorerUrl || '',
+    }
+  })
+
+  const networksToRender = [ ...defaultNetworks, ...frequentRpcNetworkListDetails ]
+  let selectedNetwork = networksToRender.find(network => network.rpcUrl === networksTabSelectedRpcUrl) || {}
+  const networkIsSelected = Boolean(selectedNetwork.rpcUrl)
+
+  let networkDefaultedToProvider = false
+  if (!networkIsSelected && !networksTabIsInAddMode) {
+    selectedNetwork = networksToRender.find(network => {
+      return network.rpcUrl === provider.rpcTarget || network.providerType !== 'rpc' && network.providerType === provider.type
+    }) || {}
+    networkDefaultedToProvider = true
+  }
+
+  return {
+    selectedNetwork,
+    networksToRender,
+    networkIsSelected,
+    networksTabIsInAddMode,
+    providerType: provider.type,
+    providerUrl: provider.rpcTarget,
+    networkDefaultedToProvider,
+  }
+}
+
+const mapDispatchToProps = dispatch => {
+  return {
+    setSelectedSettingsRpcUrl: newRpcUrl => dispatch(setSelectedSettingsRpcUrl(newRpcUrl)),
+    setRpcTarget: (newRpc, chainId, ticker, nickname, rpcPrefs) => {
+      dispatch(updateAndSetCustomRpc(newRpc, chainId, ticker, nickname, rpcPrefs))
+    },
+    displayWarning: warning => dispatch(displayWarning(warning)),
+    setNetworksTabAddMode: isInAddMode => dispatch(setNetworksTabAddMode(isInAddMode)),
+    editRpc: (oldRpc, newRpc, chainId, ticker, nickname, rpcPrefs) => {
+      dispatch(editRpc(oldRpc, newRpc, chainId, ticker, nickname, rpcPrefs))
+    },
+  }
+}
+
+export default compose(
+  withRouter,
+  connect(mapStateToProps, mapDispatchToProps)
+)(NetworksTab)
diff --git a/ui/app/pages/settings/settings.component.js b/ui/app/pages/settings/settings.component.js
index fe799a6e8..a2f137264 100644
--- a/ui/app/pages/settings/settings.component.js
+++ b/ui/app/pages/settings/settings.component.js
@@ -6,6 +6,7 @@ import { getEnvironmentType } from '../../../../app/scripts/lib/util'
 import TabBar from '../../components/app/tab-bar'
 import c from 'classnames'
 import SettingsTab from './settings-tab'
+import NetworksTab from './networks-tab'
 import AdvancedTab from './advanced-tab'
 import InfoTab from './info-tab'
 import SecurityTab from './security-tab'
@@ -16,6 +17,7 @@ import {
   GENERAL_ROUTE,
   ABOUT_US_ROUTE,
   SETTINGS_ROUTE,
+  NETWORKS_ROUTE,
 } from '../../helpers/constants/routes'
 
 const ROUTES_TO_I18N_KEYS = {
@@ -55,7 +57,7 @@ class SettingsPage extends PureComponent {
       >
         <div className="settings-page__header">
           {
-            !this.isCurrentPath(SETTINGS_ROUTE) && (
+            !this.isCurrentPath(SETTINGS_ROUTE) && !this.isCurrentPath(NETWORKS_ROUTE) && (
               <div
                 className="settings-page__back-button"
                 onClick={() => history.push(SETTINGS_ROUTE)}
@@ -104,6 +106,7 @@ class SettingsPage extends PureComponent {
           { content: t('general'), description: t('generalSettingsDescription'), key: GENERAL_ROUTE },
           { content: t('advanced'), description: t('advancedSettingsDescription'), key: ADVANCED_ROUTE },
           { content: t('securityAndPrivacy'), description: t('securitySettingsDescription'), key: SECURITY_ROUTE },
+          { content: t('networks'), description: t('networkSettingsDescription'), key: NETWORKS_ROUTE },
           { content: t('about'), description: t('aboutSettingsDescription'), key: ABOUT_US_ROUTE },
         ]}
         isActive={key => {
@@ -137,6 +140,11 @@ class SettingsPage extends PureComponent {
         />
         <Route
           exact
+          path={NETWORKS_ROUTE}
+          component={NetworksTab}
+        />
+        <Route
+          exact
           path={SECURITY_ROUTE}
           component={SecurityTab}
         />
diff --git a/ui/app/selectors/selectors.js b/ui/app/selectors/selectors.js
index ce02d067e..c7cb80024 100644
--- a/ui/app/selectors/selectors.js
+++ b/ui/app/selectors/selectors.js
@@ -49,6 +49,7 @@ const selectors = {
   getNumberOfTokens,
   isEthereumNetwork,
   getMetaMetricState,
+  getRpcPrefsForCurrentProvider,
 }
 
 module.exports = selectors
@@ -327,3 +328,10 @@ function getMetaMetricState (state) {
     participateInMetaMetrics: state.metamask.participateInMetaMetrics,
   }
 }
+
+function getRpcPrefsForCurrentProvider (state) {
+  const { frequentRpcListDetail, provider } = state.metamask
+  const selectRpcInfo = frequentRpcListDetail.find(rpcInfo => rpcInfo.rpcUrl === provider.rpcTarget)
+  const { rpcPrefs = {} } = selectRpcInfo || {}
+  return rpcPrefs
+}
diff --git a/ui/app/store/actions.js b/ui/app/store/actions.js
index 95c6dbb77..7d45f0932 100644
--- a/ui/app/store/actions.js
+++ b/ui/app/store/actions.js
@@ -239,6 +239,7 @@ var actions = {
   updateAndSetCustomRpc: updateAndSetCustomRpc,
   setRpcTarget: setRpcTarget,
   delRpcTarget: delRpcTarget,
+  editRpc: editRpc,
   setProviderType: setProviderType,
   SET_HARDWARE_WALLET_DEFAULT_HD_PATH: 'SET_HARDWARE_WALLET_DEFAULT_HD_PATH',
   setHardwareWalletDefaultHdPath,
@@ -350,6 +351,11 @@ var actions = {
 
   setFirstTimeFlowType,
   SET_FIRST_TIME_FLOW_TYPE: 'SET_FIRST_TIME_FLOW_TYPE',
+
+  SET_SELECTED_SETTINGS_RPC_URL: 'SET_SELECTED_SETTINGS_RPC_URL',
+  setSelectedSettingsRpcUrl,
+  SET_NETWORKS_TAB_ADD_MODE: 'SET_NETWORKS_TAB_ADD_MODE',
+  setNetworksTabAddMode,
 }
 
 module.exports = actions
@@ -1958,10 +1964,10 @@ function setPreviousProvider (type) {
   }
 }
 
-function updateAndSetCustomRpc (newRpc, chainId, ticker = 'ETH', nickname) {
+function updateAndSetCustomRpc (newRpc, chainId, ticker = 'ETH', nickname, rpcPrefs) {
   return (dispatch) => {
     log.debug(`background.updateAndSetCustomRpc: ${newRpc} ${chainId} ${ticker} ${nickname}`)
-    background.updateAndSetCustomRpc(newRpc, chainId, ticker, nickname || newRpc, (err) => {
+    background.updateAndSetCustomRpc(newRpc, chainId, ticker, nickname || newRpc, rpcPrefs, (err) => {
       if (err) {
         log.error(err)
         return dispatch(actions.displayWarning('Had a problem changing networks!'))
@@ -1974,6 +1980,29 @@ function updateAndSetCustomRpc (newRpc, chainId, ticker = 'ETH', nickname) {
   }
 }
 
+function editRpc (oldRpc, newRpc, chainId, ticker = 'ETH', nickname, rpcPrefs) {
+  return (dispatch) => {
+    log.debug(`background.delRpcTarget: ${oldRpc}`)
+    background.delCustomRpc(oldRpc, (err) => {
+      if (err) {
+        log.error(err)
+        return dispatch(self.displayWarning('Had a problem removing network!'))
+      }
+      dispatch(actions.setSelectedToken())
+      background.updateAndSetCustomRpc(newRpc, chainId, ticker, nickname || newRpc, rpcPrefs, (err) => {
+        if (err) {
+          log.error(err)
+          return dispatch(actions.displayWarning('Had a problem changing networks!'))
+        }
+        dispatch({
+          type: actions.SET_RPC_TARGET,
+          value: newRpc,
+        })
+      })
+    })
+  }
+}
+
 function setRpcTarget (newRpc, chainId, ticker = 'ETH', nickname) {
   return (dispatch) => {
     log.debug(`background.setRpcTarget: ${newRpc} ${chainId} ${ticker} ${nickname}`)
@@ -2000,6 +2029,7 @@ function delRpcTarget (oldRpc) {
   }
 }
 
+
 // Calls the addressBookController to add a new address.
 function addToAddressBook (recipient, nickname = '') {
   log.debug(`background.addToAddressBook`)
@@ -2716,3 +2746,17 @@ function setFirstTimeFlowType (type) {
     })
   }
 }
+
+function setSelectedSettingsRpcUrl (newRpcUrl) {
+  return {
+    type: actions.SET_SELECTED_SETTINGS_RPC_URL,
+    value: newRpcUrl,
+  }
+}
+
+function setNetworksTabAddMode (isInAddMode) {
+  return {
+    type: actions.SET_NETWORKS_TAB_ADD_MODE,
+    value: isInAddMode,
+  }
+}
diff --git a/ui/lib/account-link.js b/ui/lib/account-link.js
index 3eaa7cf71..f1428ba92 100644
--- a/ui/lib/account-link.js
+++ b/ui/lib/account-link.js
@@ -1,4 +1,8 @@
-module.exports = function (address, network) {
+module.exports = function (address, network, rpcPrefs) {
+  if (rpcPrefs.blockExplorerUrl) {
+    return `${rpcPrefs.blockExplorerUrl}/address/${address}`
+  }
+
   const net = parseInt(network)
   let link
   switch (net) {