Microsoft Stream Screen Recording doesn't work in Firefox / Blocked by Microsoft
It appears that Microsoft Stream's new screen recording feature from browser either doesn't work in Firefox, or Microsoft has blocked usage in Firefox. No attempt is made to gain browser screen-recording permissions for the site prior to the following error message appearing.
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This is up to Microsoft and their IT software to decide on which Browser they permit to use their apps. There really is nothing Firefox devs can do much if the Browser doesn't meet their Security connection protocols. The Devs can try to update but if Microsoft doesn't permit Firefox browser to use their apps then there not much Firefox can do about this. They most likely want you to use Edge if Windows to access their site apps.