Although the Start button is highlighted, does the Edit button enable if you mouse over it? This is on Windows, in case that matters:

Or is the problem that the Edit button also starts the meeting?

That’s the problem. When I click on the edit button, it opens up the meeting! All other browsers, it works fine. Except Firefox!

That's so strange, I wonder what is different between mine and yours.

For my sample meeting, when I mouse over the Start button, Firefox shows this link in the lower left corner:

https://us02web.zoom. us/s/86191908728

and when I mouse over the Edit button, it shows this link:

https://us02web.zoom. us/meeting/86191908728/edit?listType=upcoming

(The spaces were just inserted for posting)

If you mouse over the two buttons, do they both show the start link?

Yea. So strange. I’m also on a Mac mini M1.

It's difficult to think of why an extension might be modifying the link, but could you test in Firefox's Safe Mode? In its Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, any userChrome.css/userContent.css files, and some other advanced features to help you assess whether these are causing the problem.

You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" Help button > Restart with Add-ons Disabled
• (menu bar) Help menu > Restart with Add-ons Disabled

and OK the restart.

A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement?