Opera is much better than firefox, I dont know what world you are all living in.
It is the best performing browser as tested.
http://www.howtocreate.co.uk/browserSpeed.html
Its the most configurable browser.
Its the most secure (so far) but script kiddies will start trying to hack it soon.
Its the prettiest.
Firefox is only the "COOL" browser that all the Microsoft haters got on board with. Most of firefoxes features were borrowed from opera anyway.
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