Once installed, it will be available in Firefox under the Tools => Web Developer menu. The arguably biggest addition to version 3.0 is the new Push to Device feature. If you have an existing device ...

Introduced in January 2013, Firefox OS is a new mobile, Linux-based open source operating system for smartphones from Mozilla, a free software community also known as the creators of the Firefox Web ...

The following features included in the simulator are now functionally stable, according to Mozilla: Push to Device. Rotation simulation. Basic geolocation API simulation. Manifest validation.