The announcement was made by Asa Dotzler from the Mozilla team, who stated that while this still a work in progress project, Firefox Metro for Windows 8 is “stable enough” for people to give it a try.
In a different article Dotzler also noted: If you are planning to try the test version of the browser remember that you need to set Firefox as the default web browser — Windows 8 only allows one “Metro style” internet browser –. Also make sure that you double-check that you are running the latest version (Nightly > Help > About Nightly), and you cannot run the open source software in Windows RT devices. Finally, just keep in mind that the Metro version of Firefox still under development, as such don’t expect to work flawless. You can download the latest Metro Firefox Nightly build from the Mozilla website. Source Asa Dotzler All content on this site is provided with no warranties, express or implied. Use any information at your own risk. Always backup of your device and files before making any changes. Privacy policy info.
