--- a/suite/browser/browser-prefs.js
+++ b/suite/browser/browser-prefs.js
@@ -701,16 +701,20 @@ pref("dom.ipc.plugins.enabled", 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%");
 pref("plugins.update.url", "http://www.mozilla.com/%LOCALE%/plugincheck/");
 pref("plugins.update.notifyUser", false);
 pref("plugins.hide_infobar_for_outdated_plugin", false);
 pref("plugins.hide_infobar_for_carbon_failure_plugin", false);
 pref("plugins.hide_infobar_for_missing_plugin", false);
 
+#ifdef XP_MACOSX
+pref("plugins.use_layers", true);
+#endif
+
 #ifndef XP_MACOSX
 // Restore the spinner that was removed in bug 481359
 pref("ui.use_activity_cursor", true);
 #endif
 
 #ifdef XP_MACOSX
 // Use a sheet instead of a popup window for the customize toolbar UI
 pref("toolbar.customization.usesheet", true);