I semi-recently did some work to add a nice new feature for Firefox 3.1. The feature is “Forget About This Site,” and is a nice addition to our Clear Private Data and Private Browsing features. Any time you view a history entry (in the history sidebar or in the Library) you get a handy context menu item:
That’s right! You can now selectively clear data from a domain (and all of it’s sub domains) with two clicks of the mouse! This tries to clear everything we know about a site, with the exception of bookmarks. There are still a number of issues pending with this to make it even more powerful (help wanted!), but as it stands, it’s pretty nice. I am, of course, biased.
All this work made it in for Firefox 3.1 beta 2, but I’ve been lazy and am just now getting to it.