Flightgear is a 🄯Copyleft, GNU General Public License(GPL) V2, Open-source and Freely Modifiable flight simulator that champions principles of user empowerment, community-driven development, and unrestricted customization. It embodies transparency, inclusivity, and the spirit of collaborative innovation in flight simulation.
But it's the fourth most popular browser according to your chart. Considering there's probably 2 billion browser users, that's something in the ballpark of 40 million users. 20 if you say 1 billion.
Doesn't for me for some reason.. I change to chrome on windows and just get an "Oops something went wrong..." I think it might be because I forgot my password and tried like 10 of them so it locked me out, however.