Firefox developers are still in the standards organisations and their position on new proposals does have some weight on the way they're written. Google is funding Mozilla for good PR, it's not like they're in any real danger from antitrust legislation. I say take the money if they're offering and do as much good for the web as you can until it runs out. It's not like you're sacrificing anything for it, it's basically free money.
> If Google all of a sudden stops funding Mozilla, do you think that they're going to continue development of the browser?
I don't know, but even if they immediately drop Firefox when that happens, we still have it until then. If Firefox disappears now, we're fucked. But who knows what might change until then - maybe someone figures out a business model for browsers, or some other tech or policy makes it easier to compete. When/if that happens, starting from a near-monopoly is way better than a complete monopoly.
> Literally Brave
What was that about ethics again? Also, it's just a closely following Chromium fork, so they don't really have a say in how Blink develops.