19867994 story Firefox 4 Released! 554 Posted by CmdrTaco on Tuesday March 22, 2011 @12:10PM from the building-building-building dept. A great number of readers have written in to tell us that Mozilla has officially announced the final, official, Firefox 4.0. Congrats to all the developers who have code in the build. If you want some neat eye candy, you can watch a sweet visualization showing where the downloaders are.