Nice and simple, just how I want it. Would it be possible to synchronize read posts over different devices?

Very nice add-on with not many options.
There is a bug that some RSS feeds are not working, like this one: https://apod.nasa.gov/apod.rss

A simple to use RSS manager. I wish the had a disable button for each feed. Currently there is only a 'delete' button. Also i'd be nice if I could delete many feeds at once and not having to click in each one of them.

Easy to use and fast, but...
Just 4 stars because I can't stop the YouTube Sync or delete many feeds in one time :(