https://bugzilla.mozilla.org/show_bug.cgi?id=770575
770575 - Gif animation stops when I highlighted a menuitem of any menupopup
RESOLVED (nobody) in Core - Layout. Last updated 2012-11-20.
gif animation
https://bugzilla.mozilla.org/show_bug.cgi?id=1484176
1484176 - Bookmarks sub-folder menupopup would not open when dragover onto the sub-folder. It...
VERIFIED (enndeakin) in Toolkit - UI Widgets. Last updated 2018-09-17.
https://bugzilla.mozilla.org/show_bug.cgi?id=374288
374288 - Menupopup menuitems incorrectly displaying parent toolbarbutton's tooltip
VERIFIED (enndeakin) in Core - XUL. Last updated 2009-06-11.
menuitemsincorrectlydisplayingparenttooltip