Go to the Opera.
The fat lady is singin, and not about IE or Firefox.
I was an early adopter of Opera. It was my standard browser from about v2.5 or so. I used it when you had to pay for it. But after v7.23, they hosed the interface, so I couldn’t “upgrade” anymore.
Gradually more and more sites wouldn’t work with it, so I needed a browser, and I started using Firefox for the sites that wouldn’t work with Opera, till now I use it exclusively. Opera is highly customizable, so I could probably fix it, but I don’t have the time, and why should I have to anyway? It’s kind of a pain in the ass, cause I haven’t found an email client I like as well that can import all my 15,000 Opera emails or whatever, so I’m still running Opera 7.23 as my email client, and Firefox for a browser.