This addon is just great!
I like the interface and the way it lets me organize my RSS feeds.
BUT!
It has 2 drawbacks that don't allow me to classify it as the 5 star one:
1) Sometimes it corrupts all the feed DB. It already happened 3 times to me, but unfortunately I don't know the exact ways to replicate it (some PC lags?). I've restored the feeds from the backup (but lost a few new feeds and some read/unread history too). Backups are good, but addon database corruption just isn't.
2) I understand it is a multi-browser addon. But here is the disadvantage of that: the keyboard shortcuts problem. Ctrl+j is the standard Firefox hotkey to access the browsing History, but it is not working if you try to execute it on Feedbro page. It just marks current feed article as read (which is not what I would like to see). Much severe problem is the hotkey Ctrl+Shift+a which is the standard in FF to open addons page. If you run this hotkey in Feedbro tab it marks all feed articles as 'read' loosing all the read history (1000 unread articles in one of my feed folders are now marked as read and that is definitely an unacceptable behavior).

Guys, I understand that the first problem is not that easy to detect and manage, so just inform you. But the hotkey problem is the easy one. Please resolve that hotkey intersection problem. It looks like a bad style adaptation.
Thank you for you job.