Firefox 3.5 is a pretty substantial update to the popular open-source browser, and it's just around the corner. See what features, fixes, and clever new tools are worth getting excited about in the next big release.
If you accidentally close a tab you'd meant to keep open, Firefox 3, at least through extensions like Tab Mix Plus. If you accidentally kill a separate window full of tabs, though, you've been pretty much out of luck. Firefox 3.5 implements a restore feature for both tabs and windows from the History menu, which would (hopefully) also restore any text you've typed into them.
9. Tab tearing
Google Chrome somewhat stole the thunder out from under this feature, but it's still a nice one: Grab a tab and drag it out a bit to create a new browser window from it. Drag windows into tabs again, and open any tab in a new window from the right-click menu, if clicking and dragging isn't your style.