At the time a lot of people who transitioned to Chrome were still on IE7. They weren't future Firefox users. And Chrome was far faster and slicker when it come out than IE7, and a bit more than Firefox. It wasn't just advertising. It was better on a lot of useful metrics.
I feel that it is the users that are losing, not FF. It's like the meme "those who know/those who don't". People still (and forever will) trade safety/security/privacy/rights for some convenience. I expect nothing better/less from Google or Microsoft. I don't expect people to "wake up" and see what they are giving up/away.
They say that you can't save someone who doesn't want to be saved. I think that by know every person online has come across on some article that states/warns about Chrome, Edge, Google ads/tracking, etc.
We will not save those who don't want to be saved.
https://gs.statcounter.com/browser-market-share/desktop/germ... https://gs.statcounter.com/browser-market-share/desktop/us
So that is PARTLY the reason, partly is because Google had search dominance of like 95% if something across the west, and they used it to push their Browser soooooo hard, I remember the times because I still used Google at the time. The amount of times I thought to myself "no I do not use your fucking spyware browser" I think they even used anti-AdBlock measures to push you the Chrome ads through adblockers. I was using Firefox and made a conscious decision to do so. Google was funding it, but its goals were noble, it was never actually that much slower than Chrome. I think there were times, long ago, where Mozilla actually advertised with speed and benchmarks and Firefox was faster at some point, I could be wrong. Today Blink for sure is a tiny bit faster, but I really not care, on a Desktop gaming rig you do not feel any difference.
Paying to be a default search engine seems way more ethical in comparison.