I installed an ATI Rage 128 Pro Ultra, and no rendering error (I had the problem with an NVidia GeForce FX 5500). That is, the rendering error of the mousewheel only lasts for one "frame" with the ATI, but does not stay on the screen like in the screenshot of comment #7 with the NVidia. Maybe the problem is not with Firefox, but with /etc/X11/xorg.conf, or with the driver used?
I installed an ATI Rage 128 Pro Ultra, and no rendering error (I had the problem with an NVidia GeForce FX 5500). That is, the rendering error of the mousewheel only lasts for one "frame" with the ATI, but does not stay on the screen like in the screenshot of comment #7 with the NVidia. Maybe the problem is not with Firefox, but with /etc/X11/xorg.conf, or with the driver used?