You may have zoomed the page(s) by accident. Reset the page zoom on pages that cause problems. *<b>View > Zoom > Reset</b> (Ctrl/Command+0 (zero)) *http://kb.mozillazine.org/Zoom_text_of_web_pages Try to create a new Boolean pref on the about:config page via the right-click context menu with the name layout.paint_rects_separately and set the value to true and leave hardware acceleration and Direct2D enabled. *<b>layout.paint_rects_separately</b> = true That way you still have the benefit from hardware acceleration, but may not suffer from rendering issues. You can open the <b>about:config</b> page via the location/address bar. You can accept the warning and click "I'll be careful" to continue. *http://kb.mozillazine.org/about:config See also: *https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration If this didn't help then please attach a screenshot. *http://en.wikipedia.org/wiki/Screenshot *https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem *Use a compressed image type like PNG or JPG to save the screenshot *Make sure that you do not exceed the maximum size of 1 MB

The above didn't solve my problem. I checked for video card updates and there was one from AMD. Installed them and, for now, the problem seems to have gone away on the couple of websites I was having issues with.