Since Firefox updated, when I try to click on a link in my Outlook email, I get the error message, A copy of Firefox is already open. Only one copy of Firefox c

I'm on a Mac desktop.

You may be having problems in shutting down Firefox properly for some reason.
What is the exact message you receive ?
You may need to look for and kill any Firefox or plugin container processes that are still running. See [["Firefox is already running but is not responding" error message - How to fix it]]
If the problem continues a screen shot of the message may help
* see [[How do I create a screenshot of my problem?]].

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