If you've already downloaded the new Firefox 4 today, the first you probably noticed is how much zippier it is. I pretty much had stopped using Firefox altogether because of the creekiness of its previous versions compared to Chrome, Safari, and IE9. But the new Firefox 4, which Mozilla claims is 6 times as fast as before, puts it back in the same pack at least as the rest. It's been downloaded nearly 2 million times as of this writing (check the counter for more up-to-the-second numbers). I'm sure there are plenty of benchmark tests that show one browser is faster than the other, and vice versa, but my initial reactions after playing around with Firefox 4 today and comparing it side by side with Chrome is that it is just as fast if not faster. It depends on which website I visit. TechCrunch, for instance, loads a second or two faster by my stopwatch. Without the stopwatch, I can't tell the difference. And that's a good thing for Firefox, because speed is my No. 1 requirement for a Web browser. Nothing else is nearly as important. Sluggishness pushes users away. So that's fixed.