Ok you seen it somewhere ... and you are quoting an url you didn't bother reading... just read up at the bottom of the table :
http://www.w3schools.com/browsers/browsers_stats.asp
Quote:
Why so high Firefox figures?
W3Schools is a website for people with an interest for web technologies. These people are more interested in using alternative browsers than the average user. The average user tends to use Internet Explorer, since it comes preinstalled with Windows. Most do not seek out other browsers.
These facts indicate that the browser figures below are not 100% realistic. Other web sites have statistics showing that Internet Explorer is used by at least 80% of the users.
Anyway, our data, collected over a five year period, clearly shows the long and medium-term trends.
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For thoses who have websites out there, most server side stats programs and even external counters have browser stats. You might wanna look at them and realise (unless you have neard or webmaster traffic) that mozilla (firefox incl) will be arround 3-10 %.
Sadly, there aren't 25 % of internet savy people out there... if there would be, ransomware programs wouldn't exist.