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Firefox is ending support for Windows 7, 8 and 8.1, and users are urged to switch to Linux
(www.pcgamer.com)
This is a most excellent place for technology news and articles.
Ah assumed when you said VLC, you where just plugging the laptop into the TV via HDMI or something.
I also read you mentioned you where able to login but not see files, so wrong route to go down.
If you don't wanna run a server all the time for movies then vlc might be the better option, though I don't see why jellyfin shouldn't technically work.
If your libraries aren't populating after being setup, maybe check file permissions for the 'jellyfin' user?