There were a couple that used firefox's native live-bookmarks system to register new feeds but I think that was killed off along with the old extension system.

There were a couple that used firefox's native live-bookmarks system to register new feeds but I think that was killed off along with the old extension system. Now they can't handle RSS feeds natively so they need to access webpages to be able to register RSS links. Guess it shows how sacrificing usability for security doesn't necessarily lead to more security. I'm currently using Brief, and have been using it for quite some time. Still haven't found an alternative I liked. And I guess with the live-bookmarks dead it's harder than ever to switch. I might give Feeder a try.