I like the Vulfpeck track Christmas in LA. Technically it may be a cover, but I haven’t heard the original.

Librewolf supports letterboxing as well, though the setting might be disabled by default

Agreed. That’s a really bold claim to make without citing (credible) sources

…it was DNS

I’m running kubuntu on your same 2012 MBP. Runs great, but I’ve considered going pure Debian too, maybe still with KDE Plasma. You look happy; cool background!