To use these add-ons, you'll need to download Firefox.

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Iceggiren i Video Background Play Fix

Video Background Play Fix sɣur JanH

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Icegger-it Aseqdac Firefox 15187390
sɣur Aseqdac Firefox 15187390, לפני 6 שנים
This works exactly as advertised. It enabled YouTube to play audio in the background on Firefox even when with the screen off.