Comment 30 for bug 263661

I just viewed that the site provided in the above post and it rendered fine for me. I am almost wondering if this might be a graphics driver issue.

If either one of you could provide information on your hardware and what graphics driver your running it might provide us with some clues. I know with some low end graphic cards you sometimes run into graphic issues, or sometimes a strange screen resolution, but then you wouldn't only be concerned with firefox and have it happening "some" of the time.

At this point I think it might be wise to request some hardware information:

# uname -a > uname-a.log
# cat /proc/version_signature > proc_version_signature.log
# sudo lspci -vvnn > lspci-vvnn.log (those are 2 v's not a w)

Also the make and model of your video card would be helpful.