In the case of Chrome, you can't blame Google. They made a good browser, did some marketing and it got popular. However the current situation is worrisome, because alternative implementations are dying and in the case of the web, diversity is important. Both Opera and Microsoft's Edge are now powered by Chromium. Chromium is a project controlled by Google. Its redeeming quality, in terms of its open source nature, is…
99.9% of browser users don't care or don't even know if their browser is open source - what they want is convenience and ease of use. I hope Mozilla prioritizes the ones that actually matter - the users, over whatever philosophy it claims to live by, that often times isn't rooted in customer centricity.