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NixOS is the best operating system I absolutely cannot recommend to anyone - Anurag Singh
(www.xda-developers.com)
A community for everything relating to the GNU/Linux operating system (except the memes!)
Also, check out:
Original icon base courtesy of lewing@isc.tamu.edu and The GIMP
Firefox's use of Encrypted Media Extensions violates the GNU Free System Distribution Guidelines as it allows for playing of DRM-protected content which can steer people to non-free software (there may be additional other reasons but that's one I definitely know of).
But it's perfectly available in NonGuix; I use Firefox regularly on Guix.
As for Librewolf, I'm not sure that's accurate? I see it available in the default Guix repo.s, latest version: https://packages.guix.gnu.org/packages/librewolf/.
It was added about 2 years ago. Admittedly, Guix is a smaller distro so some packages aren't packaged immediately just as a consequence of a lack of human resources; but it also continues to improve over time, quite nicely.