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I've downloaded a couple of versions of Firefox to several computers; but I haven't installed it yet. However, it's not the acquisition of the Fox that will do your computer or you good, but the ripping out of IEx; and yes, it can be done. Do that, and you'll have something to sing about.
I've been with Opera since 3.6x, now have 7.11, and there is nothing, NOTHING, better. Shoot, even O 3.62 is better than any ver of IE.