For over a week I've not been able to open FF--I get a message that says "FF is already running but is not responding. To open a new window, you must first close the existing FF process, or restart your system." I've tried the following: scanning my computer completely for malware and viruses (got rid of all threats); going into Task Manager and looking for multiple versions of the mozilla.exe or firefox.exe (in fact there were none at all listed); downloading various versions of FF (3, 4, and 5). None of this has made a difference. I've been using Google Chrome for some time, as a result. But all my bookmarks are in FF, and they're very necessary for my work. I also like FF.
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Do a scan with Malware Bytes first. Use the free version
Export your bookmarks out of Firefox if you cannot even use firefox use another browser to help you. Use Chrome or Internet Explorer and import firefox bookmarks and data.
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Try the following:
Restart your computer.
After it restarts, don't try to start Firefox.
Go to your Firefox profile folder in the appdata (or type this in your search box - %APPDATA%\Mozilla\Firefox\Profiles\). Get the xxxx.default profile open.
Delete the lock file parent.lock
If this cannot be …
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