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TIL Firefox doesn’t support HEVC. Hadn’t really noticed that before, I guess it’s why some Jellyfin streams started transcoding for me.
It is supported in the nightly build and full support is in the works currently.
https://connect.mozilla.org/t5/ideas/hevc-support/idc-p/63424/highlight/true#M36557
Neither does it support HDR content
You’re better off using the Jellyfin Media Player standalone application anyway.
I know, it’s just handy to sometimes open the website, don’t have to have anything installed. Normally I watch through HTPC that had Kodi with Jellyfin integration. That’s a fantastic combo, best of both worlds.