premise: Firefox is one of the most popular web browsers.
hypothesis: Firefox . Firefox usage grew to a peak of 32 % at the end of 2009 , temporarily making version 3.5 the world 's most popular browser . , Firefox has between 9 % and 16 % of worldwide usage as a `` desktop '' browser , making it the second most popular web browser . Firefox is still the most popular desktop browser in Cuba ( even most popular overall ) , Eritrea , and Germany , with 85.93 % , 79.39 % , and 37.01 % of the market share , respectively . It is also the most popular desktop browser in many other African countries .