--- a/mailnews/mailnews.js
+++ b/mailnews/mailnews.js
@@ -740,16 +740,18 @@ pref("ldap_2.servers.oe.dirType", 3);
 #endif
 #endif
 #ifdef XP_MACOSX
 pref("ldap_2.servers.osx.uri", "moz-abosxdirectory:///");
 pref("ldap_2.servers.osx.description", "chrome://messenger/locale/addressbook/addressBook.properties");
 pref("ldap_2.servers.osx.dirType", 3);
 pref("mail.notification.sound",             "");
 pref("mail.notification.count.inbox_only", true);
+// Work around bug 482811 by disabling slow script warning for chrome scripts on Mac
+pref("dom.max_chrome_script_run_time", 0);
 #endif
 
 // gtk2 (*nix) lacks transparent/translucent drag support (bug 376238), so we
 // want to disable it so people can see where they are dragging things.
 // (Stock gtk drag icons will be used instead.)
 #ifdef MOZ_WIDGET_GTK2
 pref("nglayout.enable_drag_images", false);
 #endif