Hi donntrent1,

You might want to take a look at this article:

http://kb.mozillazine.org/Window_shakes

You could also try starting Firefox in Diagnose Firefox issues using Troubleshoot Mode to see if it's an add-on/theme issue or you could try creating a new profile.

Hopefully this helps!

Try to disable hardware acceleration.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

If disabling hardware acceleration works then check if there is an update available for your graphics display driver.

• https://support.mozilla.org/kb/how-do-i-upgrade-my-graphics-drivers

thanks. I have disabled a number of plug-ins that I can't recall installing - silverlight, quark promote, google talk, microsoft office, and Java. The constant flickering seems to have stopped, so thanks. It still flickers on scrolling, but I guess I can live with that

Thanks - I use Windows Update automatically, so the drivers are up to date. I have cured the constant flickering by disabling most of the plug-ins - silverlight, quark promote, google talk, microsoft office, and Java. The constant flickering seems to have stopped, so thanks. It still flickers on scrolling, but I guess I can live with that