Firefox reports it is running but not responding.
In trying to use features of various apps, the app tries to connect to Firefox, resulting in an error message "Firefox is already running, but is not responding. The old … (read more)
In trying to use features of various apps, the app tries to connect to Firefox, resulting in an error message "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." But in fact, Firefox IS running. An example of this problem is invoking updates of some apps; another is in Zoom trying to login using SSO. It leaves me stuck, and the only solution I have found is to use Edge instead of Firefox.