Mozilla decided to remove its fantastic live bookmarks feature that seamlessly integrated RSS within bookmarks in 2018 with Firefox 64. Someone then made an extension which was ported to Chromium, and then back again to Firefox because original one was abandoned.

A dedicated extension is needed to have that feature back. Chrome needs one as well, so does Edge; only Vivaldi and Opera come with build-in feed readers. There are of course standalone applications but that seems to be a niche nowadays.

I've found an old rssowl opml file from 2014 last week and I decided to see what's still up. I've found some RSS readers in flathub but sadly, majority of what I was visiting back then died.