will not boot up
When trying to open firefox the following message appears.
Firefox is already running, but not responding. The old Firefox process must be closed to open a new window. If I pic Close Firefox the error message goes away but comes back. I've tried uninstalling and reinstalling with and without resetting to default but no help. Same issue appears.
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Try to delete parent.lock in the profile folder.
Location used for the main profile that keeps your personal data.
- C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>
You can create a new profile as a quick test to see if your current profile is causing the problem.
See "Creating a profile":
If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.