won't open sites
Firefox stops working. When I close Firefox, and try to reopen I get this message -- Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.
There is no Foxfire window to close. The only way I am able to get Firefox up and running it to shut down the computer, and the process starts all over again.
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https://support.mozilla.com/en-US/kb/Firefox%20hangs
See hang-at-exit