I was thinking of just going entirely to Nix. The last time I tried it was 2021 (on a dual boot where I also tried Arch cause my colleague was bemoaning my Ubuntu usage). Yeah, it is annoying having to look up how to configure things the Nix way, but it all makes sense and it stems from the fact every application does it 'their way'.

Either way, I just wanted to note you can use APT to include Mozilla's Firefox and Thunderbird repo. That way, you get a .deb from them.

One specific thing I like about Ubuntu: I know a new version gets released every six months (I believe OpenBSD innovated this?) and the version is recognized by date. The LTS is released every two years around april in the even years. Otherwise it is april/october.