Issue 2520 - Enable extension compatibility checking again

mobile/android/app/mobile.js

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #filter substitution
 
 // For browser.xml binding
 //
 // cacheRatio* is a ratio that determines the amount of pixels to cache. The
 // ratio is multiplied by the viewport width or height to get the displayport's
@@ skipping 178 matching lines @@
 pref("extensions.dss.enabled", false);
 pref("extensions.dss.switchPending", false);
 pref("extensions.ignoreMTimeChanges", false);
 pref("extensions.logging.enabled", false);
 pref("extensions.hideInstallButton", true);
 pref("extensions.showMismatchUI", false);
 pref("extensions.hideUpdateButton", false);
 pref("extensions.strictCompatibility", false);
 pref("extensions.minCompatibleAppVersion", "11.0");
 
-// We need to disable compatibility checking in Adblock Browser for now,
-// since it uses different versions than Firefox, and we don't want to modify
-// the embedded Adblock Plus at this point. In the future, Adblock Browser
-// should have its own app ID, and we should properly declare compatibility in
-// Adblock Plus.
-pref("extensions.checkCompatibility.nightly", false);
-
 pref("extensions.update.url", "https://versioncheck.addons.mozilla.org/update/VersionCheck.php?reqVersion=%REQ_VERSION%&id=%ITEM_ID%&version=%ITEM_VERSION%&maxAppVersion=%ITEM_MAXAPPVERSION%&status=%ITEM_STATUS%&appID=%APP_ID%&appVersion=%APP_VERSION%&appOS=%APP_OS%&appABI=%APP_ABI%&locale=%APP_LOCALE%&currentAppVersion=%CURRENT_APP_VERSION%&updateType=%UPDATE_TYPE%&compatMode=%COMPATIBILITY_MODE%");
 pref("extensions.update.background.url", "https://versioncheck-bg.addons.mozilla.org/update/VersionCheck.php?reqVersion=%REQ_VERSION%&id=%ITEM_ID%&version=%ITEM_VERSION%&maxAppVersion=%ITEM_MAXAPPVERSION%&status=%ITEM_STATUS%&appID=%APP_ID%&appVersion=%APP_VERSION%&appOS=%APP_OS%&appABI=%APP_ABI%&locale=%APP_LOCALE%&currentAppVersion=%CURRENT_APP_VERSION%&updateType=%UPDATE_TYPE%&compatMode=%COMPATIBILITY_MODE%");
 
 pref("extensions.hotfix.id", "firefox-android-hotfix@mozilla.org");
 pref("extensions.hotfix.cert.checkAttributes", true);
 pref("extensions.hotfix.certs.1.sha1Fingerprint", "91:53:98:0C:C1:86:DF:47:8F:35:22:9E:11:C9:A7:31:04:49:A1:AA");
 
 /* preferences for the Get Add-ons pane */
 pref("extensions.getAddons.cache.enabled", true);
 pref("extensions.getAddons.maxResults", 15);
@@ skipping 761 matching lines @@
 pref("identity.fxaccounts.remote.webchannel.uri", "https://accounts.firefox.com");
 
 // The remote URL of the Firefox Account profile server.
 pref("identity.fxaccounts.remote.profile.uri", "https://profile.accounts.firefox.com/v1");
 
 // The remote URL of the Firefox Account oauth server.
 pref("identity.fxaccounts.remote.oauth.uri", "https://oauth.accounts.firefox.com/v1"); 
 
 // Token server used by Firefox Account-authenticated Sync.
 pref("identity.sync.tokenserver.uri", "https://token.services.mozilla.com/1.0/sync/1.5");