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I use firefox, been using it forever. Tried chrome but just couldn't get into it. Never was a fan of IE.
 
Used to be a Firefox only across the board, but I've since discovered I much prefer Chrome on newer versions of Windows/OS X

On my older Macs and PC's though, TenFourFox/older versions of Firefox seem to work best.
 
Usually Chrome because it holds all my passwords hostage and is cross-platform. If not, I'm usually fine with the OS default. A web browser is a web browser, I care not for the small measures of performance they have over one another.
 
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