Recent answers to How to grant permanent access to Microphone granted from within an iFrame without being asked for permission everytime?https://support.mozilla.org/kn/questions/12753862019-12-19T00:18:14-08:00Currently, Firefox cannot store a permanent permission when the host server of the outer page and th2019-12-19T00:18:14-08:00jscher2000https://support.mozilla.org/kn/questions/1275386#answer-1274720<p>Currently, Firefox cannot store a permanent permission when the host server of the outer page and the framed page are different (for example, Hangouts embedded in Gmail). This might change in a future version but I think it requires the website to send a feature policy header pre-approving it somehow.
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