When I join a Google Hangout and try to share my entire screen, Firefox always prompts me whether to share a window or the entire screen. I always want to share the entire screen. But when I enable the checkbox for "Remember this decision" I get this warning: Firefox can not allow permanent access to your screen.

Why does this happen? Is it because I'm on a Mac, or is it specific to macOS Catalina?

  • I would think it is a security issue. – Steve Chambers Mar 13 at 1:03
  • @SteveChambers I'm pretty sure there was a time when I didn't get this prompt, so I guess my question is what changed? – Nic Mar 13 at 1:03

I don't think it's a Mac specific problem. I saw the same message on Windows and solved it with following steps:

  1. Write about:config to url searchbox and press Enter. You will see advanced Firefox settings.

  2. Create variable full-screen-api.approval-required and set it to true.

  3. That's it, you are now allowed to share your screen with Firefox.

| improve this answer | |
  • This had potential, but I still get the same prompt after setting the variable as described here. :( – Nic Apr 10 at 0:08

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