Minefield from Mozilla is an early build of the next version of Firefox with drastically improved Javascript engine under the hood. Some claim it has the fastest javascript engine on the planet, which means it leaves Google Chrome in the dust. You can download the alpha code of the latest nightly build for Mac OS X, Linux, or Windows. Simply Download the file to your desktop, right click extract and double click the minefield binary, or create a launcher on your panel that executes firefox with -P to create a new profile.

Source:→ Ubuntu Unleashed