I think it was Kevin Lee at Sitepoint had a very interesting blog article on browsers and the new IE.
I’ve just recently switched to using FF primarily, but I would never count IE out. Keep in mind browsers are free, but I do believe any day that MS wants to make IE a priority, they at least have the capital to run circles around everyone else. I don’t necessarily agree, but I have a feeling that the thought has been "why fix it if the majority of people don’t know it’s broke."
While FF may be better and more stable, there are certainly some quirks and frustrations here and there as well and they owe much of their acclaim to IE’s disdain. If FF ever achieves a near even split or the type of use of IE, I wouldn’t be surprised to see just as many security issues there as well. So far, I’m sure it just hasn’t been a big enough piece of the pie for hackers to warrant the devoting resources to when IE commands such a large share of the market. Given the same conditions, why rob a bank if you can rob a depository!
In some ways though, I feel a little sorry for the Opera folks. I understand that Opera has a greater following internationally than it does in the States, though even FF has probably taken some of that focus as well, and it sounds like they’ve made some huge inroads to the mobile market. Seems like a lot of the things people have commended FF for, Opera had long before.
Like they say, "It isn’t about building a better mousetrap, it’s about marketing the mousetrap." Okay, I don’t know if anyone has ever said that before, but it works for me