Firefox 3.5 has been a rip-roaring success it seems, with over 5 million people downloading the browser in 24 hours. The launch brought an extra 2% to Firefox's market share, upping it to 31.8%.

"The fastest version yet of Firefox has certainly sprinted out of the blocks with 2.06% usage in the US in a short time", said StatCounter CEO, Aodhan Cullen.

Meanwhile, Mozilla's already got another patch planned. 3.5.1 will be released "soon" to patch out bugs that the team behind the browser didn't manage to get rid of before the launch. It'll kill at least three major bugs.

Firefox's last major launch - 3.0, a year ago - garnered 7 million downloads in 24 hours, though that was conducted alongside a large PR campaign for a record attempt at the most downloads in a day.

Are you running Firefox 3.5? Have you run into any show-stopping bugs? How's the speed, compared to 3.0? Let us know your thoughts in the comments.