great addon ! I used Sage until FF 57 was released and it stopped working but since I started with FeedBro (just few days now) and it is much. much more advanced. fast, easy, simple.

One small request if it will be possible to add for a future release: add a link to the source web page. for example: i use FeedBro mainly for youtube. as the youtube feed is limited to the last 15 entries per channel, you want to be able to open the channel's page and browse for the missing upload you didn;t have in the feed.
Maybe to add the link above the view of the feeds or something...

Other than that: great piece of software !
Omer.