I don't know what intention you had when you posted that link but it clearly disproves that anyone uses the terrible built-in RSS reader in firefox.

Here, just take a look at the first response:

>Literally 99.99% of Firefox users did not use the built in RSS support[1].

>I love RSS! I also never used the built in Firefox RSS support because it was not very good. Mozilla also compiled a helpful list of alternative RSS readers for the 0.01% of users that used this feature and made it easy to export your feed list[2].

>[1] https://www.gijsk.com/blog/2018/10/firefox-removes-core-prod...

>[2] https://support.mozilla.org/en-US/kb/feed-reader-replacement...

Ok, so you're just trolling. Too bad.