Ubuntu

Comment 24 for bug 274575

The first thing would be to try with Firefox 3.5 and see if the problem is gone (firefox-3.5 package in Jaunty, or can be downloaded from http://www.mozilla.com/en-US/firefox/all-beta.html).

Then checking if the issue is still there with the "NoAccel" option can answer if the issue is in Firefox or your graphic card driver.

If the issue is with your graphic card driver, then Firefox can't do much about it unfortunately (except bypassing XRender but that's not for the immediate future).