User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b2pre) Gecko/20081024 Minefield/3.1b2pre Build Identifier: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b2pre) Gecko/20081024 Minefield/3.1b2pre On the preferences dialog, when I go to the Advanced section, the selected tab for that section always extends a little too far down and out to either side (see attachment). I've actually seen this issue in numerous places in Firefox, including the normal web page tabs when I have the Tab Mix Plus extension enabled with multi-row tabs (only happens for tabs above the bottom row). It looks like the tab widget in general is not getting drawn correctly. Reproducible: Always Steps to Reproduce: 1. Go to the Preferences dialog 2. Select "Advanced" Actual Results: The tabs are drawn incorrectly, as described. Expected Results: The tabs are drawn correctly, without extra space at the bottom. This is reproducible in both the Default theme as well as the "Vista on XP" theme. Probably others, but I didn't check. My computer is running Ubuntu Hardy Heron, and it's 64-bit. Other than that, it's a pretty standard installation. I'd be glad to help fix this problem if someone can point me in the right direction. I'm a pretty good coder, but don't have any experience with Firefox's code base.