I use Firefox almost exclusively for both personal and business use (I'm a web applications developer). I use Chrome/Safari and IE to test, but otherwise don't really use them on a day to day basis.
For my professional needs, Firefox is a far better environment for testing and prototyping code. The built in toolkit is quite powerful and feature rich, and if you add Firebug into the mix, there is nothing you can't do.
For personal needs Firefox is likely the only browser I can grant my trust. It's the only major browser that isn't built by a large corporation with financial interest in my internet usage. This might not bother other people, but for me it's a significant concern that the top browser in North America is built by an advertising company who profits off user data.
As far as performance goes - I haven't noticed a difference between the two browsers for years. Honestly, outside of their respective corporate goals, there really isn't much different between Firefox and Chrome.
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