@Egg > I understand why now. The video does have a audio track, but without any content. FF must see the audio track and therefore not permit autoplay with a Block Audio setting.Looking further your video (link below) has no audio so ought to play at my original setting of 'Block Audio setting will prevent autoplay for all media with sound'. Puzzled.
By way of a test, I edited the video - removed the audio track and ran a test with FF Block Audio and all was well. https://initiostar.co.uk/assets/No Audio Track.mp4
Thanks for identifying this little gremlin. I have used "autoplay muted loop" in all cases, but FF seems to ignore the "muted" control, where Chrome and Edge seem to accept it.
Gary
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