Don't worry, you won't need 10. Firefox and IE are enough. Use Firefox for everything except what it won't work with, because of Active X, sloppy code, or whatever.
Is there and extension for Firefox or something else that allows me to use zone.com in firefox. I hate it when websites only work on 1 browser. Imagine having 10 browsers (that might be an exageration) on your computer so you can view different websites.