Oh snap!
If you don't already use the latest version of Firefox, then I suggest you download it RIGHT NOW! At first I thought the most amazing aspect about it was the spell check and the tabs. But oh no, it gets much better than that. Just now, I had to close all my browser windows because a PDF file caused them all to freeze up. I was really pissed off since I would have to find a bunch of journal articles all over again. But as soon as I double clicked on the Firefox icon, it asked me if I wanted to restore all of my tabs. Everything I needed was back! Huzzah!