Despite failing the Acid2 test, Firefox 2 is the most standards compliant browser after IE.
I am not familiar with the Opera code since is not open source, one of it's flaws actually. It does render some pages rather clunky but that has nothing to do with it's render engine. But most of those glitches are caused by the fact that web dev's don’t always adhere to the W3C web standards. FF is more tolerant with coding mistakes that is true.
However a few months ago FF had more security flaws than IE. I have all 3 browsers installed however I do not trust FF or IE (yet) for my credit card transactions.
At this exact time this is the security status of the most common browsers:
IExplorer 7.x: 7 security holes;
- Status: Moderately critical (3 of 5)
FireFox 2.x: 4 security holes;
- Status: Less critical (2 of 5)
Opera 9.x: 0 security holes;
- Status: Normal (0 of 5)
Safari 2.x: 3 security holes;
- Status: Less critical (2 of 5)
Konqueror 3.x: 2 security holes;
- Status: Moderately critical (3 of 5)
I do not want everybody to start using Opera just like that and I am certainly not trying to convince
btarunr that he should just hop right back in Opera wagon just because I think it’s the better browser at the moment. Like I said it’s about personal taste at this point.
I just want to raise the level of awareness of the general public about how things really are, and about how much Opera Software contributed to what the internet is right now. I bet that many features that it has currently implemented will eventually be integrated in the other browsers, as it has happened until now.
Back on topic now, as this discussion has derailed a bit, I think it's ok for Microsoft to bundle it's explorer as version 7 is user friendly and is a huge leap (partially because it has "borrowed" code from FF and because it has a rather cleaned up interface now).