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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

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  • Last reply by John99

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I'm on a Mac desktop.

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First try restarting your computer - that's the easiest way to get everything Firefox to close.

If that doesn't work, resetting Firefox should do the trick. Instructions and details are here - Refresh Firefox - reset add-ons and settings

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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 - How to fix

If the problem continues a screen shot of the message may help