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I have been using Firefox as my default browser for years and it is my favorite browser. Sometimes when I start my Firefox, it doesn't show up and it says "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.".
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Well, here is an easy fix.
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1. Open
Windows Task Manager (CTRL+ALT+DEL). Or just right click on your taskbar and select
Start Task Manager.
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2. On the
Task Manager, click on the
Processes tab and find firefox.exe.
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3. Then click the
End Process button and press
Yes.
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4. Run the Firefox again and that's it!
