Bookmarking pop-up is a jumble of colored squares tonight. Had this problem during one of the beta versions.
When I try to bookmark a page, the pop-up for bookmarking is a meaningless jumble of colored squares. When I click inside the jumble, sometimes the box appears as it should, but when I try to scroll through my categories, it either goes back to the jumble, or disappears. This happened quite a bit during the development of the new Firefox, but not much lately until tonight.
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
- https://support.mozilla.com/kb/Safe+Mode
In Firefox 4 Safe mode disables extensions and disables 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.