It’s a path inside the container, but not inside /config. You should mount the file like this:

volumes:
  - /path/to/local/theme.css:/jellyfin/jellyfin-web/theme.css

You should put it in Jellyfin’s web root folder (paths are relative to it). In the official container it’s /jellyfin/jellyfin-web.

Then you just @import "theme.css";.

Romero’s Night of the Living Dead is in the public domain as well.

You can find it in the Internet Archive here: https://archive.org/details/night_of_the_living_dead

It could be an issue with the codecs (browsers are usually pretty limited in what they support). You could try to use a client like Jellyfin Media Player instead. It bundles libmpv, so it plays almost any video format there is.

Since you are sharing anecdotes, let me join.

For me FF has always been extremely stable, and I too regularly keep 100+ tabs open, on much more limited system resources. It is so stable that I’ve completely disabled history saving, and if there is something I want to read later I just keep the tab open. Never had an issue.

Tree Style Tabs also pushed me to have many tabs, because now I can actually organize those that I’ve opened and find them later.

You should put some quotes where you use the array:

not_what_you_think=( "a b" "c" "d" )
for sneaky in "${not_what_you_think[@]}"; do
  echo "This is sneaky: ${sneaky}"
done

This is sneaky: a b
This is sneaky: c
This is sneaky: d