I've seen thousands of Chrome ads in my life. On TV, on FB, on other ads on other websites, etc. I really don't think I've ever seen a FF ad. At least, I really can't recall seeing one. From what I've seen, the public has just not really heard of them. It's mostly just us geeks. It's hard to get market share when your audience doesn't even know you exist. And then you have Android, which comes with Chrome and has a much larger worldwide audience than iOS. I don't know how this is different than windows shipping with IE in the 90s, except Alphabet is allowed to continue while MS was not. Android has about 76% of the world market compared to iOS's ~22%. iOS has been in a slow decline most of this year as well, while Andoid is going up by as much. https://gs.statcounter.com/os-market-share/mobile/worldwide