I've been using Sage on Firefox for the last decade. Its absolutely barebones but does the job for me. However with Firefox 57 Quantum its likely it wont be sup

I've been using Sage on Firefox for the last decade. Its absolutely barebones but does the job for me. However with Firefox 57 Quantum its likely it wont be supported, so I looked at Feedly, but it was a bit too Hollywood for me. Any suggestions for something simple and clean like Sage?