It’s even easier with Brew: have terminal window open, type brew install librewolf & if MacOS complains, xattr -d com.apple.quarantine /Applications/LibreWolf.app (for example to get a nice bland browser without corporate spyware). Every now and then, brew upgrade librewolf.
I setup music with Clementine, and output analog via the jack. Surely there must be better way… But it was easy & I can choose songs to play from cellphone.