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) {
+#if defined(NIGHTLY_BUILD) && defined(HAVE_SHIMS)
+    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/mozapps/extensions/internal/moz.build

@@ -14,6 +14,9 @@ EXTRA_JS_MODULES.addons += [
     'SpellCheckDictionaryBootstrap.js',
 ]
 
+if CONFIG['MOZ_BUILD_APP'] in ['browser']:
+      DEFINES['HAVE_SHIMS'] = True
+
 # Don't ship unused providers on Android
 if CONFIG['MOZ_WIDGET_TOOLKIT'] != 'android':
     EXTRA_JS_MODULES.addons += [

toolkit/xre/moz.build

@@ -105,6 +105,9 @@ if CONFIG['MOZ_UPDATER']:
 
 MSVC_ENABLE_PGO = True
 
+if CONFIG['MOZ_BUILD_APP'] in ['browser']:
+      DEFINES['HAVE_SHIMS'] = True
+
 include('/ipc/chromium/chromium-config.mozbuild')
 
 FINAL_LIBRARY = 'xul'

toolkit/xre/nsXREDirProvider.cpp

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