What should you do when your computer or browser freezes up?

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Some sites are really bad about making my browser bar freeze. Before I got broadband, browser crashes were an every day happening. Now, it's not so bad. But, it does still happen. And, most times, my browser and computer freezes up at the worst time. Sometimes when my computer freezes up, I'll go through my documents and delete old files and ebooks that are junking up my system. Not that I'm blaming the junk for slowing down my computer. But, it gives me an excuse to "clean house" on my computer. Then after my browser goes back to normal, I continue my Internet browsing experience as usual. How do you pass the time waiting for your computer to unfreeze? Do you reboot your computer, so you don't have to put up with the hassle of waiting?