I think those stats are probably somewhat skewed towards webmasters, but no matter how you cut it Firefox kicks Opera's but in the numbers game. There are things I like about Opera, but when it comes to basic functionality, it has hasn't improved, it's actually getting worse. In the case of Firefox it's the bugs that have gotten worse over the years. Both sets of programmers have their heads buried in the sand, Mozilla can't be bothered to fix bugs and Opera can't be bothered to standardize basic functionality (or even offer a standards option for those that want it). Both deserve to fail.
Opera harp on about standards and yet they cannot see that it's their non-standard user interface that's holding them back - crazy, absolutely crazy.