hello

i want to find out which browsers are bigger in which parts of the world, and the ratios

however

the browser names are quite confusing on this page:
https://stats.wikimedia.org/wikimedia/squids/SquidReportCountryBrowser.htm

mozilla and firefox are two seperate entities ? is one mobile and the other desktop ?
iOS is also seperate from ipad and iphone ? why so ?

thanks
thomas