I am having similar problems with Firefox 12.0 & Pale Moon 12.0 x64.
Here is a screenshot of Pale Moon 12.0 x64: http://i.imgur.com/RyCZf.png
Notice the corruption in the tabs & Pale Moon menu tab at the top of the screen.
Screenshot of Firefox 12.0: http://i.imgur.com/KtTj2.png
Notice the corruption in some of the tabs & on the new tab button.
Corruption also occurs when you switch from one tab to another.
Screenshot of corruption in Firefox 12.0 when switching between tabs:
I posted about this issue in the Nvidia driver forum.
Here's the link if you're interested:
http://forums.nvidia.com/index.php?showtopic=224078&view=findpost&p=1407590Edited by Thundermitty - 5/12/12 at 8:36pm