Firefox OS App Buttons
Button styles vary based on the type of action they trigger. The correct style should be used for each button to ensure consistent interaction and coherent visuals. Some buttons – such as disabled idle buttons – are background sensitive. Make sure to correctly apply styling for buttons on dark backgrounds.
Action buttons are placed at the bottom of the screen and may have 2 different sizes, a longer button when 1 button is needed, and a shorter length when 2 buttons are needed.
When the button(s) affects the content of the whole screen, it is placed at the botton, divided from the rest of the content pane by a horizontal line and a 5% darker rectangle.
You can download the Firefox OS Stencil PSD here.