Firefox 2.0 Beta
Firefox 2.0 is available in Beta now. Don't install this if you have extensions you need; few are ready to work with this yet. As usual, expect that there can be bugs and unfriendly behavior.
However, if you are curious about what's coming up in the next Firefox, there are some long needed improvements. No doubt the most desirable new feature is "Undo Close Tab". Each open tab now has an individual "X" to close it, which probably decreases your chances of closing something accidentally, but if you do, just right click (Mac: ctrl-click) on any other tab and choose Undo Close Tab. Should you close more than one tab in your haste (again, that was much more likely with the old single "X" interface), you'll find "Recently Closed Tabs" in your History.
Should Firefox crash...