diff --git a/mozilla/modules/libpref/src/init/all.js b/mozilla/modules/libpref/src/init/all.js
index 55db7e1ea1f..058296ac792 100644
--- a/mozilla/modules/libpref/src/init/all.js
+++ b/mozilla/modules/libpref/src/init/all.js
@@ -414,7 +414,7 @@ pref("dom.allow_scripts_to_close_windows",          false);
 
 pref("dom.disable_open_during_load",                false);
 pref("dom.popup_maximum",                           20);
-pref("dom.popup_allowed_events", "change click dblclick reset submit");
+pref("dom.popup_allowed_events", "change click dblclick mouseup reset submit");
 
 pref("dom.event.contextmenu.enabled",       true);