Has anyone else found the firefox app on android buggy? Always crashes when switching to full screen when watching a video but will work when opening it again immediately. Gets into the wrong state with private vs non private tabs etc.

My raspberry pi 3b+ could absolutely direct stream 4k locally, transcoding is a different story. Is your pi connected via ethernet?

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There’s definitely alternatives to the Jellyfin UI, there was one that popped up here a few days ago?