It works really *but* I think an alternative icon or simply changing the icon into one which doesn't have a box around it would make it fine more nicely with the other address bar icons.

Another newsblur user here, this extension does exactly what I need.
However, I always have to reload the feed page before I can select my reader. On the first load, the dropdown box and "subscribe Now" button are greyed out.

Great, but how can I integrate it with feed-readers like Feedbro?

Would it be possible to integrate the reader into the "Subscribe to this feed using..." box?

This is a very cleanly done extensions, I'm impressed by the preview layout. It's a winner.

I hope that it will support opening up feeds with an local application, too. But I can see if this somehow adds a security concern (an extension calling an external application), it isn't desirable.