Hacker News Reader

Firefox used to support RSS, but they removed it in late 2018.

Thunderbird supports RSS...and NNTP.

The feature could use some work however. I remember trying it recently and OPML support (especially when you have sub-folders) didn't really work.

Personally I use Smart-RSS [1], which is a clone of the original Opera (12) feed reader and runs as a browser extension (both chrome/ium and firefox). It has some bugs but it works well for my use case.

[1] https://github.com/SmartRSS/Smart-RSS

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