I think it's time to add Screen Control permission as many use Twitch, Discord or any screen sharing website/service to make video calls or streaming and Firefox is unable to allow permanent access to the screen., this is what it says when I want to grant automatically further control to Discord screen sharing requests.
Discord support team told me they encountered some problems on running Discord on Firefox (compatibility-related), but they didn't tell which exactly for privacy and company rules.
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While writing this post:
The idea posting failed so I had to write it partially again. Do it once again and I uninstall immediately.