My favorite feature about Firefox is the fact that it remembers passwords allot better than IE, and if you, for whatever reason, lose your browser (if it crashes on you) you can restore your session.
And Opera has a master passord that makes it more secure to use that browser on your account.
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Not reading every post but here's my 2 cents worth (God I hate that phrase)
1 - I use Firefox and have done since it was Firebird.
2 - Opera is far from perfect with a recent update being to patch no less than 3 exploits
3 - Opera fails the new Acid test 2 (or does it pass now? I should check) IE8 also passes as does Firefox 3
4 - If you run a Joomla site with Gzip turned on it will screw up in any browser identifying it's self as Opera. But tell Opera to ID as IE and it works fine. That's more than likely down to sloppy coding by Joomla.
I used to use Opera back around 6.5 but today I think the mail client sucks and Opera is getting to gimicky with it's bit torrent client and it's recent anti trust suit against Microsoft just stinks of a sore loser.
From a developer point of view, Firefox has my vote, simply because IT DOES WHAT I TELL IT TO DO! It doesn't require fourteen hacks to get it display the way I had originally intended, it simply takes the instructions I give it, and displays the end result properly.
IE's not going away anytime soon, but I'd advise anyone who doesn't already to build in Firefox, fix for IE.
From a personal point of view, Firefox and Opera are getting close...I dig some of the new features Opera offers, but would be hard pressed to replace FF with it.
What's to quibble about? I started using Firebird and then they changed the name to Firefox so my statement is perfectly valid.