Very nice and light extension! Rated 5 out of 5 stars
I used another feeder before and it caused Firefox to stop responding very often. This one so far doesn't make me these problems.
I also found that the default folder for Brief can be changed easily - you can highlight each one that you want on Brief's Options.
You say that style can be easily changed. But it is probably for advanced users. Can you give some real examples of different styles with appropriate screenshots that amateors like me can learn how to "play" with styles with minimum damage?