User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1) Gecko/20090624 Firefox/3.5 Only File=>Exit closes Firefox window. The following do not work : The top-right X-box; Alt-F4; Top-left icon Right-click-menu->Exit; Windows taskbar Right-click-menu->Exit I'm surprised I didn't see this one in the Bugs List... *-David-* Reproducible: Always Steps to Reproduce: 1. Open Firefox 2. Try to close window with all standard methods other than File->Exit 3. Window does not close; nothing happens. Actual Results: Nothing happens and window does not close Expected Results: The Firefox window should close. None.
Please retest in safe-mode to rule out extension problems: http://support.mozilla.com/en-US/kb/Safe+Mode
Caused by an add-on. Marking dupe of bug 501018. No one has reported which add-on is causing this though.