Mozilla fought back on Wednesday in the US with some performance results to show a forthcoming version of Firefox outpacing Google's new Web browser, Chrome.

(Credit: Mozilla)

During a launch event Tuesday in the US, Google was eager to toot its horn about Chrome's performance running JavaScript, a programming language used to power many sophisticated Web applications such as Google Docs, Yahoo's Zimbra e-mail site, and Zoho's online application suite.

Google showed performance results using its own collection of five JavaScript benchmarks and V8, Chrome's JavaScript engine, but Mozilla countered with a different test called SunSpider.

"We're very much in the game and moving fast: 'reports of our death are greatly exaggerated," JavaScript pioneer and TraceMonkey coder Brendan Eich said in a blog. And noting Firefox's higher score, he said, "Maybe we should rename TraceMonkey 'V10' ;-)"

Firefox 3.1, which Mozilla hopes to release by the end of the year, comes with JavaScript acceleration technology called TraceMonkey. In Mozilla's test that pitted TraceMonkey-enhanced Firefox against the Chrome beta, Google's browser was 28 per cent slower on Windows XP and 16 percent slower on Windows Vista.

However, Eich said in his post that the TraceMonkey team was addressing one particular issue that hobbled TraceMonkey compared to Chrome.

"(One) graph does show V8 cleaning our clock on a couple of recursion-heavy tests. We have a plan, to trace recursion," he said on the blog. "We simply haven't had enough hours in the day to get to it, but it's 'next."