That’s not an alternative frontend, but a different albeit very similar platform. With an alternative frontent you can see the same content, but with better and different features, usually without ads and with better privacy.

8GB ram version €110

Official store on aliexpress: https://www.aliexpress.com/store/1102112699/pages/all-items.html?productGroupId=40000001788832&storeId=1102112699&shop_sortType=bestmatch_sort

Armbian is available for this board: https://www.armbian.com/orangepi-5-max/

It’s just the regular monthly anti firefox FUD.

Install docker, grab the official docker compose file, then docker compose up -d.

Details: Look up how to install docker on elementary (I guess it’s sudo apt install docker), than you don’t have to care about the distro after that, docker works the same way everywhere. You can find countless tutorials on this, and they should work

Are you trying to install jellyfin server or client?

Elementary 8 circe is based on Ubuntu 24.04 LTS, which is based in debian 13, which has a codename “trixie”.