I tried out Brief. It looks nice but there are a couple of problems:
1) There also doesn't seem to be a way to sort them by date or alphabetical order or domain.[0][1]
2) It seems like it should be possible to 'group' feeds, but I couldn't figure out how.
3) When Firefox updates certain things break
I think as a result of this I will try out newsboat. I found this tutorial[2] that seems to explain it nicely.
[0]: https://github.com/brief-rss/brief/issues/208
I use Thunderbird as well, and that has RSS support but to me that seems counter to my workflow. Typically I'll be on some site and want to subscribe, and then view in my browser. Doesn't really make sense to be in an email client.
On my phone I use Flym[2]
[0] https://addons.mozilla.org/en-US/firefox/collections/4757633...
[1] https://addons.mozilla.org/en-US/firefox/addon/brief/
[2] https://github.com/FredJul/Flym