Since v.24 (and perhaps v.23), Firefox doesn't quit properly on my Win7 computers (2 of them, anyway). THe exe file remains as a process until I kill it. Why?
When I quit (using the close button), the window closes. However I am frequently unable to restart Firefox -- I get a system message saying that it is still running. When I look process tab of the Task Manager, a process called firefox.exe is in fact still running. However, there is no application in the application tab, and I can't switch to it. The process never ends buy itself.
I have to end the process or the process tree using the Task Manager. Only then can I restart Firefox. It seems to me that the problem has only begun to occur recently, perhaps with v.24.
This happens on two different Win7 machines. They are both fully patched
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Some possibilities are suggested in the "Hang at exit" section of this article:
http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit
There's quite a bit to work through there.
Does this also happen if you use "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit) to close Firefox?
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).
- Do NOT click the Reset button on the Safe Mode start window.
- https://support.mozilla.org/kb/Safe+Mode
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can also check for problems caused by plugins.
In case you are using "Clear history when Firefox closes", try to exclude the cookies.
- Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
- https://support.mozilla.org/kb/Clear+Recent+History