Great, but lists feeds from header only? Rated 5 out of 5 stars
Unfortunately, it doesn't list all possible RSS feeds one could get on the site. I think FF 3.* featured this.
Maybe it takes notice only of feeds mentioned in the header like https://addons.mozilla.org/en-US/firefox/addon/rss-icon/ does?
A very good reaction to the bug, though! Thumbs up!