Most used web browser :

Chrome : 53%
IE : 15%
Firefox : 14%
Safari : 9%
Opera : 2%
Other : 3%

There are less and less users of Firefox with the time, due to leaks and slowness. Mozilla thinks about a new version that would revolutionize its main software.

More : Browser Trends January 2016: 12 Month Review
Mozilla explores radically different browser as Firefox leaks share | Computerworld