I voted for FF even though I'm starting to use Chrome a bit more than before.
here's why:
FF:
Huge amount of addon options
Great Developers tools - And frankly, even though chrome has good dev tools, i seem to find my way around FF dev tools easier with less hair loss. :p
Doesn't appear to bug out as bad as IE & Chrome when visiting websites using outdated / depreciated code
I'm just so used to it that it's hard to change completely over to something else yet
Chrome:
Appears to be more stable than the latest FF
Appears to run smoother / faster than the latest FF
Now has lots more Addons to choose from, but still not as many as FF
Has a great chopped down version for android mobile devices
IE:
Full of bugs and doesn't seem to conform to other browser standards
I kick myself every time I have to use it, as it reminds me every time why I don't
Chopped down version for windows mobile devices seems to work fine though
Opera:
Works fine for my mobile devices but not really that good otherwise
Not as many addons or support
Netscape:
Do people actually still use that?
Safari:
Basically the same framework as FF but with less support and less addons
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In Conclusion: The above is just my personal opinions. Eventually I may make the leap to start using chrome as my primary and move FF to secondary status. However, for now, I'm still sticking with FF as primary. I'll be keeping tabs on chrome more though to see how they expand in the future.
Eric Lyon