Well, that is the number of users that Firefox has, which little by little was gaining ground from the tyranny of Internet Explorer. According to My stats, 27% of visitors to this site use Firefox, it is not for less if there is a version in 34 languages and is used in 230 countries.
And continuing with the strong promotion carried by the Google fox, they intend in June to beat the Guinness record of more downloads the same day, which we do not know the date but which they are calling
"The download day "
They have placed a map where you can see the countries that have promoted the campaign, for the moment the United States takes first place, followed by Spain.
So if you have never downloaded it, cheer up, sooner or later you will end up doing it.