Bug 1126311 - Don't show OMTC warning when opening windows on Linux if e10s enabled by default. r=felipe.

--HG--
extra : amend_source : 333c7b92790cd6060eafbd7dfd36ce47b61da636

browser/base/content/browser.js

@@ -3872,7 +3872,10 @@ function OpenBrowserWindow(options)
   }
 
   if (options && options.remote) {
-    let omtcEnabled = gPrefService.getBoolPref("layers.offmainthreadcomposition.enabled");
+    // If we're using remote tabs by default, then OMTC will be force-enabled,
+    // despite the preference returning as false.
+    let omtcEnabled = gPrefService.getBoolPref("layers.offmainthreadcomposition.enabled")
+                      || Services.appinfo.browserTabsRemoteAutostart;
     if (!omtcEnabled) {
       alert("To use out-of-process tabs, you must set the layers.offmainthreadcomposition.enabled preference and restart. Opening a normal window instead.");
     } else {