I can't open firefox the running but not responding window opens and says to close the existing window. I can't do that shutting down the computer doesn't do anything to help. I've done all the suggestions here. I've uninstalled and reinstalled firefox
Firefox will not open. I get the firefox is already running but not responding window... I have tried rebooting with no help. I have tried to end the process via cntrl+shift+esc and nothing firefox is listed to end. I have tried find the app data via the run icon in the start up window, I have no run icon on this system (Acer with windows vista(?)
This happened
Every time Firefox opened
The computer was hard shut down and did a improper shut down scan when it was restarted
User Agent
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; FunWebProducts; GTB6.5; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729)
Chosen solution
Un-installing and re-installing Firefox doesn't affect your personal data and settings in your Firefox Profile folder, unless you specifically select that option when un0installing Firefox - but that deletes "all your personal data and customizations".
Have you tried creating a new Profile after a cold boot? http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
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Chosen Solution
Un-installing and re-installing Firefox doesn't affect your personal data and settings in your Firefox Profile folder, unless you specifically select that option when un0installing Firefox - but that deletes "all your personal data and customizations".
Have you tried creating a new Profile after a cold boot? http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
This only happens in Windows7. I have reinstalled but to no avail. The only way I can run Firefox is to reboot every time I want to open it. This is totally unacceptable. I cannot delete the parent.lock file - which is a ZERO-BYTE file - so this is clearly a bug. Sadly I am un-installing Firefox and going over to Chrome - after 6 years of using Firefox this is really frustrating because it looks as if there is no action to fix it.
Modified by gladesbay@gmail.com
I am having a similar problem. Running Xp.
Latest revision of firefox. After using firefox for a while if I exit, parent.lock is locked and i have to reboot to reload firefox.
I have killed all firefox applications from task manager (usually there are none). and I have tried 3 different "file unlock" programs including unlocker to no avail.
I also recently installed a program that shows -all- open files, and parent.lock is not listed, and thus not closable/unlockable from there.