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When I open firefox a popout appears "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window" Your Firef

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when i try to open firefox the message "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window" appears and then i press on close window button again a popout appears saying "Your Firefox profile cannot be loaded. It may be missing or inaccessible" I tried uninstalling and installing firefox a lot of times and I deleted firefox folder in Appdata folder to remove parent lock and rest of stored data I tried Normal startup option in MSConfigure and then firefox opened first time and second time it again shows same popout. But if I set firefox not to store any kind of history the firefox working even though it sometimes shows the pop-up "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window".

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Start your Computer in safe mode with networking. Then start Firefox. After a bit, close it. Then open it a few minutes later.

Starting The Computer In Safe Mode;
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You can check for issues caused by plugins and set all plugins to "Ask to Activate" on the "Firefox/Tools > Add-ons > Plugins" page