No icons after updating to Firefox 4

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Update FF from 3.6 to 4.0

What do you expect to happen? What do you see instead?
When opening the search engines selection menu, there is no icon left to the 
engines names.
They appear only left to the search box and in the manage dialog.

What version of the product are you using? On what operating system and
Firefox version?
Version 1.7 with FF4 from ppa stable on ubuntu 10.10 32bits, fr locale

What other add-ons are you using?
Adblock plus
Add to search bar
Better privacy
Brief
Download statusbar
Element hiding helper for adblock
Menu editor
More tools menu
Mozilla archive format
NoScript
Nuke anything enhanced
OpenBook
Save file to
Scrapbook
SkipScreen
SmoothWheel (AMO)
Table2Clipboard
Update scanner

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 25 Mar 2011 at 12:27