diff --git a/app/browser/reducers/windowsReducer.js b/app/browser/reducers/windowsReducer.js
index 233bdc4132b..edcd81afb5a 100644
--- a/app/browser/reducers/windowsReducer.js
+++ b/app/browser/reducers/windowsReducer.js
@@ -98,12 +98,9 @@ function windowDefaults (state) {
     minModalWidth: 100,
     windowOffset: 20,
     webPreferences: {
+      // XXX: Do not edit without security review
       sharedWorker: true,
-      nodeIntegration: false,
-      partition: 'default',
-      webSecurity: false,
-      allowFileAccessFromFileUrls: true,
-      allowUniversalAccessFromFileUrls: true
+      partition: 'default'
     }
   }
 }
diff --git a/app/browser/share.js b/app/browser/share.js
index ff25a2482a6..99e0a35164f 100644
--- a/app/browser/share.js
+++ b/app/browser/share.js
@@ -8,7 +8,7 @@ const {shell} = require('electron')
 const tabs = require('./tabs')
 
 const templateUrls = {
-  email: 'mailto:?subject={title}&body={url}',
+  email: 'mailto:?subject={title}&body={url}', // Do not edit without security review
   facebook: 'https://www.facebook.com/sharer.php?u={url}',
   pinterest: 'https://pinterest.com/pin/create/bookmarklet/?url={url}&description={title}',
   twitter: 'https://twitter.com/intent/tweet?url={url}&text={title}&hashtags=brave',
diff --git a/app/browser/tabs.js b/app/browser/tabs.js
index bebe53607e4..3d6aeb50e55 100644
--- a/app/browser/tabs.js
+++ b/app/browser/tabs.js
@@ -5,10 +5,9 @@
 const appActions = require('../../js/actions/appActions')
 const windowActions = require('../../js/actions/windowActions')
 const tabActions = require('../common/actions/tabActions')
-const config = require('../../js/constants/config')
 const Immutable = require('immutable')
 const tabState = require('../common/state/tabState')
-const {app, BrowserWindow, extensions, session, ipcMain} = require('electron')
+const {app, extensions, session, ipcMain} = require('electron')
 const {makeImmutable} = require('../common/state/immutableUtil')
 const {getTargetAboutUrl, getSourceAboutUrl, isSourceAboutUrl, newFrameUrl, isTargetAboutUrl, isIntermediateAboutPage, isTargetMagnetUrl, getSourceMagnetUrl} = require('../../js/lib/appUrlUtil')
 const {isURL, getUrlFromInput, toPDFJSLocation, getDefaultFaviconUrl, isHttpOrHttps, getLocationIfPDF} = require('../../js/lib/urlutil')
@@ -699,22 +698,6 @@ const api = {
     })
   },
 
-  executeScriptInBackground: (script, cb) => {
-    const win = new BrowserWindow({
-      show: false,
-      webPreferences: {
-        partition: 'default'
-      }
-    })
-    win.webContents.on('did-finish-load', (e) => {
-      win.webContents.executeScriptInTab(config.braveExtensionId, script, {}, (err, url, result) => {
-        cb(err, url, result)
-        setImmediate(() => win.close())
-      })
-    })
-    win.loadURL('about:blank')
-  },
-
   moveTo: (state, tabId, frameOpts, browserOpts, windowId) => {
     frameOpts = makeImmutable(frameOpts)
     browserOpts = makeImmutable(browserOpts)
diff --git a/test/unit/app/browser/tabsTest.js b/test/unit/app/browser/tabsTest.js
index 409865d388c..af4bdde92d0 100644
--- a/test/unit/app/browser/tabsTest.js
+++ b/test/unit/app/browser/tabsTest.js
@@ -352,11 +352,6 @@ describe('tabs API unit tests', function () {
     })
   })
 
-  describe.skip('executeScriptInBackground', function () {
-    it('todo', function () {
-    })
-  })
-
   describe.skip('createTab', function () {
     it('todo', function () {
     })