Except safari of course (almost 20% market share).
Also, there are plenty of other browsers using Mozilla’s gecko engine. A quote from Wikipedia: “ Other web browsers using Gecko include GNU IceCat, Waterfox, K-Meleon, Lunascape, Portable Firefox, Conkeror, Classilla, TenFourFox.” (en.m.wikipedia.org/wiki/Gecko_(software))