Running the Firefox OS add-on for the Firefox browser is the quickest and easiest way to get it working in under a minute, and it works on Windows, Mac, and Linux.
Install the Firefox OS Simulator
Please follow these easy steps to install and run the Firefox OS Simulator add-on for Firefox:
Open your Firefox browser.
Open this link to the Firefox OS Simulator add-on.
Click on the button + Add to Firefox. Firefox will download the requested add-on and ask you to confirm that you want to install it.
Click on the button Install – the add-on will be installed.
Run the Firefox OS Simulator
At the top of the Firefox window, click on the Firefox button.At the top of the Firefox window, click on the Tools menu.At the top of the Firefox window, click on the Tools menu (on Ubuntu in the menu bar, click on Tools).On the menu bar, click on the Tools menu.
Go over to the Web Developer menu, and click Firefox OS Simulator.
On the left side of the simulator window, click on the switch Stopped so that it will turn to Running.
The simulator will start and you may now start playing with Firefox OS!
Tip: Use the home or fn+left arrow buttons on your keyboard to simulate the home button on the device.