Here is a port on the mozilla addons page… Seems legit but no source code on how it is making the actual build…

Also RSSHub Radar for use with RSSHub its awesome… Some good sites have no RSS feed sadly

I currently use Feedly (its proprietary though)… I have in mind switching to my own instance of FreshRSS which looks awesome and has its mobile compatible apps too.

I would also like to mention two little tricks that made my life easier with RSS:

• First RSSHub: it allows you to made a RSS feed out of almost anything! RSS can be awesome…
• Second, in GitHub if you append ‘.atom’ to any relases of a repostory you get a RSS feed for releases (which I use to track different releases) for example for lemmy https://github.com/LemmyNet/lemmy/releases.atom

Hope this helps!

Have been using Mlem for a while now… But I find it worth to try and provide feedback!