Bug 261655 ��� Can't completely disable the new "Install Missing Plugins" infobar. r=mconnor, a=mconnor

browser/app/profile/firefox.js

@@ -434,6 +434,9 @@ pref("plugin.default_plugin_disabled", true);
 // plugin finder service url
 pref("pfs.datasource.url", "https://pfs.mozilla.org/plugins/PluginFinderService.php?mimetype=%PLUGIN_MIMETYPE%&appID=%APP_ID%&appVersion=%APP_VERSION%&clientOS=%CLIENT_OS%&chromeLocale=%CHROME_LOCALE%");
 
+// by default we show an infobar message when pages require plugins the user has not installed
+pref("plugins.hide_infobar_for_missing_plugin", false);
+
 #ifdef XP_WIN
 pref("browser.preferences.instantApply", false);
 #else

browser/base/content/browser.js

@@ -1,4 +1,4 @@
-# -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+# -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 # ***** BEGIN LICENSE BLOCK *****
 # Version: MPL 1.1/GPL 2.0/LGPL 2.1
 #
@@ -5053,6 +5053,11 @@ missingPluginInstaller.prototype.newMissingPlugin = function(aEvent){
                                    false);
   }
 
+  try {
+    if (gPrefService.getBoolPref("plugins.hide_infobar_for_missing_plugin"))
+      return;
+  } catch (ex) {} // if the pref is missing, treat it as false, which shows the infobar
+
   var tabbrowser = getBrowser();
   const browsers = tabbrowser.mPanelContainer.childNodes;