The article is quite poorly written, and the title mentions ubuntu even though it has nothing to do with the feed readers (there are instructions for arch, but not ubuntu)
I love NixOS, but OP is probably a new user (or doesn't care about managing/customising their system), since they want a distro like mint (which is mostly a distro for new users/ a "just works" distro). So NixOS would probably suck for them
+1 for the Tree Style Tabs extension. There's nothung quite like it on any other browser (thougb I heard vivaldi does something similar? I'll try that, but it's still chr*mium, so not for me)
They're "experimental" because the RFC wadn't approved IIRC, but everyone in the community (and the new documentation) talks about amd used the new commands.