Bug 1317101 - Part 7d: Load moz-extension: URLs remotely based on a pref. r=billm

MozReview-Commit-ID: Kxt9mDMdPQk

--HG--
extra : rebase_source : 77ea447ec1c6977c2fa5506311c76ddf38929126
extra : source : 0f8144296a9d8e67a4f307491559a0051f95a9a7

browser/modules/E10SUtils.jsm

@@ -9,6 +9,10 @@ this.EXPORTED_SYMBOLS = ["E10SUtils"];
 const {interfaces: Ci, utils: Cu, classes: Cc} = Components;
 
 Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyPreferenceGetter(this, "useRemoteWebExtensions",
+                                      "extensions.webextensions.remote", false);
 
 function getAboutModule(aURL) {
   // Needs to match NS_GetAboutModuleName
@@ -119,7 +123,7 @@ this.E10SUtils = {
     }
 
     if (aURL.startsWith("moz-extension:")) {
-      return NOT_REMOTE;
+      return useRemoteWebExtensions ? WEB_REMOTE_TYPE : NOT_REMOTE;
     }
 
     if (aURL.startsWith("view-source:")) {