Being able to display feeds is a nice thing to have in a browser. But a dedicated native feed reader is almost always a better way to go. QuiteRSS handles large (1000+) feed lists well.
The only thing that seems to reliably motivate Mozilla to change their browser is when Google adds a new feature, so I am confident that Firefox will get RSS support again.
A shout-out to NetNewsWire from me. It's perfect.
It would be a lot more perfect if you could force it to push local state to the cloud when it syncs (or vice versa). Automagically applying heuristics doesn't always work so well.
I really need to sit down one weekend and figure out how to make this work (by iterating through DB.sqlite3 and pushing the appropriate entries to Sync.sqlite3... I think...).
Currently actually using Thunderbird for this, since I couldn't find standalone software that I actually liked (though RSS Guard felt close to what I was looking for https://github.com/martinrotter/rssguard) and I wasn't looking for an online reader for this, nor did I want browser integration (too many separate browser installs across multiple computers).
Turns out that Thunderbird's built in functionality is pretty much sufficient and works nicely: https://blog.thunderbird.net/2022/05/thunderbird-rss-feeds-g...
Essentially now I have a few folders next to my e-mail accounts and I can read them when I want, the usage mode being surprisingly similar to e-mails (e.g. ignoring an account or two until I feel like browsing them, vs the immediate notifications of instant messaging). Plus, the UI/UX is pretty much regular Thunderbird as well, so nothing new there - it's familiar and usable.
Without XSLT, Firefox displays an ugly XML view and offers no suggestion that the URL might serve any useful purpose.
With XSLT (see mine below), you can make it much healthier, but you're then still the person trying to explain how to use RSS. Browsers used to form part of this protocol handling element.