Mozilla has registered over 3.5 million downloads of Firefox 4 just hours after releasing the final build of new browser.
Firefox 4 was made officially available for download today, and Mozilla has released final code for Windows, Mac OS X and Linux in more than 80 languages. Versions for the Android and Maemo operating system are expected shortly.
An online counter has been set up for new downloads and the total looks likely to break five million by the end of the day.
"Firefox 4 is the fastest Firefox yet. With dramatic speed and performance advancements across the board, Firefox is between two and six times faster than previous releases," blogged Mozilla.
The browser comes with the Do Not Track privacy feature, as well as tools to synchronise bookmarks over multiple systems and mobile devices, as well as an improved add-ons manager and an updated user interface that makes more use of tabbing to make the browser more customisable.
Support for the new software has easily outstripped that shown for Microsoft's latest Internet Explorer 9 (IE9) browser, which clocked up two million downloads in its first 24 hours.
However, Firefox pushes out upgrade options to users rather than waiting for them to download new software like Microsoft, and IE9 will not work on most of the Windows PCs in operation today so is of limited appeal.
Warming was most pronounced in Siberia region
The tank will be subjected to high stresses and loads via dozens of hydraulic cylinders during testing
'Sunlit wet sidewalk' provides evidence of methane rainfall on the north pole of Saturn's moon Titan
Methane rainfall indicates the start of the summer season in Titan's northern hemisphere
Scientists believe there could be other hydrides or superhydrides with super conducting properties