Before upgrading to Firefox Quantum, I used SageRSS to read my favorite news sites, and I was very disappointed that it would not work after the browser upgrade. I started using Firefox's 'live bookmarks' function, but there is no way to mark an entire site 'read' unless one clicks on every story. Then I found Drop-feeds. This add-on is excellent--it does everything I need!

Thanks to the developers for a great add-on!