User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; de; rv:1.9) Gecko/2008061004 Firefox/3.0 Build Identifier: version 3.0a1 (2008050714) If I click on "Tools -> Add-ons" the add-ons window doesn't open. Instead only the title bar appears. Reproducible: Always Steps to Reproduce: 1.Click on "Tools -> Add-ons" 2. 3.
Does this happen if you are running in safe mode? (http://kb.mozillazine.org/Safe_mode). Could you try a later build to see if this is still a problem?
Thank you for the hint how to run TB in safe mode. This helped me to find out that the bug was caused by the "Crossover X 2.6" theme, I was using. Since I deactivated it, it works fine again!
->INVALID (FIXED is only used when known code changes resolved the issue) https://bugzilla.mozilla.org/page.cgi?id=fields.html#resolution