It's interesting to think about, that the two ways to prevent the misuse of your data would either be total privacy or total transparency.

I was mostly joking, since I can't imagine anyone buying a Google Chromebook in an attempt to avoid Google. But, for the sake of argument, I do think it's genuinely straightforward.

The internal details are slightly complicated, but from a user's perspective, all you have to do is press one button from inside settings, open a terminal, and type "sudo apt install firefox".

That's not as easy as downloading a setup.exe file, but I think it's pretty straightforward. ChromeOS will even associate URLs with Firefox, if you choose. Then, even if you open Chrome, it will redirect all links back into Firefox.

Just a small technical tangent of my own. :D