Firefox ≥94 'already running, but is not responding'

[dpanter]

There are a few situations where this old bug shows its ugly face again, instead of opening links you get an error message:

Firefox is already running, but is not responding. To use Firefox, you must first close the existing Firefox process, restart your device, or use a different profile.

Please see the bug report for more details.
https://bugzilla.mozilla.org/show_bug.cgi?id=1738881

If you wish to downgrade, consider the issues seen with earlier versions of 94 and 93.
https://forum.siduction.org/index.php?topic=8448.0