Firefox/RSS feed/that orange button in the URL box

So, for anyone running Firefox, you know the little orange box that looks like a speaker where you type in the URL? I've figured out it is a button to do some sort of bookmark that is an RSS feed. I do not, however, know what the heck an RSS feed is. But, it seems that I could bookmark threads and they would update automatically? Don't regular bookmarks do that? Does it like announce when something changes?

What is an RSS feed, why is it a bookmark, and what does it do with TCS threads?

The RSS Bookmark updates with the latest feed. Think of it being a bookmark that does what the "New Posts" query does. You click on the bookmark and the latest posts are listed.

BTW - I had to show the Bookmarks toolbar in order to see it.

Have you seen this thread? http://www.thecatsite.com/forums/sho...d.php?t=108730 I've managed to get an RSS TCS feed, but not to limit it to a single forum, which is what I wanted to do.