Competition is a good thing for end users of software. The emergence of the season hit, the Google's Chrome browser, has really challenged and pushed forward Firefox engineers and technologies. In fact, as Adrian Kingsley-Hughes comments in his Zdnet blog, the release of Firefox 3.1 beta 1 is including a number of significant improvements in terms of functionality, and also on efficiency.
Firefox beta scores higher than Chrome on the first two. But not all readers consider the comparison fair.