Quit Firefox for Mobile allows user to quit Fennec (Firefox for Mobile) by closing all open tabs or selecting ‘Quit’ from the Firefox for Mobile menu. This add-on is more for developers as most Android users should not need to have to ‘quit’ Firefox as the Android OS automatically pauses applications when they are in the background, and closes them when free memory is needed. However, they may be times you want to quickly exit Firefox (such as to wanting to start a fresh session).
Quit Firefox for Mobile works with Firefox for Mobile 4.0 or newer. The add-on can be downloaded here or scan the bar code below with your phone to install directly.