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I am using 2 (kinda) at the moment.
I was using Chrome for a while but the bugs were annoying the hell outta me. I loved the really clean look and the unibar but the bugs got the better of me so I have swithed to camino as my main browser for the moment. Mainly because I like having favicons in my bookmark bar.
I still default to safari from time to time because it is solid so if i get issues with camino i know i can rely of safari.

Also I have tried both opera and flock and neither appealed to me. Flock was a bit too busy and I just didnt like Opera too much.
 
I used to use Flock, but I switched to Firefox as they were based on the same engine, more or less.

I do have Safari installed but almost never use it.
 
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