First, you’ll need to open your Firefox profile folder.
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This is because Firefox is still running in the background, doing housekeeping tasks and saving your data before quitting completely.
If you wait a few seconds and try launching Firefox again, you may find that it opens properly.
Click the gear icon in the upper right-hand corner.
Click the Downloads icon in the upper right-hand corner.
You can also click the header to sort the process list alphabetically and locate
Once you’ve located firefox.exe, select it and click the End Process button.
This error occurs when Firefox is closed but is still running in the background.
Firefox is either in the process of closing or is frozen and hasn’t quit properly.
This is more complicated, and requires the free software Wget.