In honor of the rather soon release of Firefox 3, I've decided to start a discussion.
What is the best feature of Firefox you never use?
For me personally, it's the extensive bookmarking features. Especially in Firefox 3, Firefox has some really good bookmarking tools. Allowing you to tag and search your bookmarks nearly instantly with the new address bar, as well as the new "Smart" bookmarks that customize kinda like the "Smart" playlists in iTunes. I've never really messed with bookmarks, and always found them a bother. But I'm pretty good at pulling sites back up with Google, so it's rarely a problem. To a large degree, Google is my bookmarking system.