Someone already reported it:
https://bugzilla.mozilla.org/show_bug.cgi?id=508221
** Bug watch added: Mozilla Bugzilla #508221
https://bugzilla.mozilla.org/show_bug.cgi?id=508221
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Firefox needs to use "gtk_image_menu_item_set_always_show_image" for essential
icons.
https://bugs.launchpad.ne
Using Firefox 3.5.2 in karmic. It displays correctly bookmarks and
history icons, but I still think the search engines menu (see
attachment) should display the icons.
** Attachment added: "Firefox search engines menu"
http://launchpadlibrarian.net/31186256/engines.png
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Firefox needs to use