User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; rv:1.7.3) Gecko/20040913 Firefox/0.10 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; rv:1.7.3) Gecko/20040913 Firefox/0.10 When closing firefox with either alt+f4 or the close button, the window disappears. If i try to rerun firefox, nothing happens. By going to the Task manager, firefox.exe is still running and must be killed before any attempt to reopen firefox. Once that is done, firefox runs fine. Reproducible: Always Steps to Reproduce: 1. Alt + f4 or Close button 2. 3. Actual Results: Process is still running but no visible firefox window Expected Results: killed the firefox process Installed extensions : Tabbrowser, Adblock, SingleWindow, Download Statusbar, Download Sort, Linkification Installed Theme : Noia 2.0

Does this also in Safe Mode (which means all extensions are disabled)? FF can be started in Safe Mode under Start > Programs > Mozilla Firefox > Mozilla Firefox (safe mode)

*** This bug has been marked as a duplicate of 239223 ***