Created attachment 813751 [details] firefox_tab_overlap.png User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Firefox/24.0 (Beta/Release) Build ID: 20130917081302 Steps to reproduce: 1. Start downloading a file which opens an external application 2. Start drag'n'drop a tab 3. Wait for the download to finish 4. Wait for the application to start I use Arch Linux 64 bit. I tried out on Windows 7 too but the same happened. Actual results: - Two tabs overlapped (see attached picture) - "Close Tab" buttons doesn't work - Tab context menus doesn't work - Tab drag'n'drop doesn't work Expected results: Either cancel the drag'n'drop or finish it in the current position.
Are you able to reproduce the issue with HWA disabled? https://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration
(In reply to Loic from comment #1) > Are you able to reproduce the issue with HWA disabled? > https://support.mozilla.org/en-US/kb/forum-response-disable-hardware- > acceleration Yes, I can reproduce the problem with HWA disabled. (I disabled it and restarted Firefix before the test)
Maybe something old like bug 100180.