Bug 1063156 - Enable e10s shims by default, even when browser.tabs.remote.autostart pref is false.r=billm

toolkit/mozapps/extensions/internal/XPIProvider.jsm

@@ -4282,12 +4282,13 @@ this.XPIProvider = {
 
     let principal = Cc["@mozilla.org/systemprincipal;1"].
                     createInstance(Ci.nsIPrincipal);
-
-    if (!aMultiprocessCompatible && Services.appinfo.browserTabsRemoteAutostart) {
+#ifdef NIGHTLY_BUILD
+    if (!aMultiprocessCompatible) {
       let interposition = Cc["@mozilla.org/addons/multiprocess-shims;1"].
         getService(Ci.nsIAddonInterposition);
       Cu.setAddonInterposition(aId, interposition);
     }
+#endif
 
     if (!aFile.exists()) {
       this.bootstrapScopes[aId] =

toolkit/xre/nsXREDirProvider.cpp

@@ -551,9 +551,7 @@ nsXREDirProvider::GetFiles(const char* aProperty, nsISimpleEnumerator** aResult)
 static void
 RegisterExtensionInterpositions(nsINIParser &parser)
 {
-  if (!mozilla::BrowserTabsRemoteAutostart())
-    return;
-
+#ifdef NIGHTLY_BUILD
   nsCOMPtr<nsIAddonInterposition> interposition =
     do_GetService("@mozilla.org/addons/multiprocess-shims;1");
 
@@ -572,6 +570,7 @@ RegisterExtensionInterpositions(nsINIParser &parser)
       continue;
   }
   while (true);
+#endif
 }
 
 static void