Mozilla, Ericsson, AT&T will show the web technology's video, voice calling, and file-sharing chops at the Mobile World Congress this week.
Mozilla Tuesday released Firefox 19, adding a built-in PDF viewer to the browser and patching 13 security vulnerabilities.
The preliminary Metro browser has reached the source code repository that feeds into Mozilla's 'Nightly' build channel
The device provides a general idea of what to expect when Firefox OS handsets debut in the coming months
The browser's mobile version is now available to 15 million more phones, Mozilla says.
Users can now keep their existing Firefox windows open when they launch a new private window.
Thanks to its renewed search partnership with Google, the Firefox maker's revenues are up 33 percent.