Firefox, but I do like the way Chrome works. I just don't really trust Google I guess.
I use Safari on Macs, it's not my favourite browser UI-wise, but it sure is fastest on a mac
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I used opera for years but it just became over the top. I like extra functionality, but I want to install it myself once I feel like I need it.
IE just plain sucks. Worst browser ever.
And then I use K-meleon which is based on Firefox. It's made for older computers so I install it on my PII's and such. Really nice;.