I really don’t see how supporting Manifest V3 is a problem. It’s still going to be used by many extension developers, and there’s no harm in its availability as long as you can still block WebRequest, which is currently the case. On the Mozilla taking Google’s money point, sure, that’s true, but it doesn’t seem to have affected too much of the browser, other than search defaults abd a few other things that can be very easily turned off or removed entirely. I wouldn’t say the chances are particularly high for Manifest V2 to be completely removed, personally.
Lula’s always been pretty good with calling out other people’s bullshit around Latin America, it isn’t particularly surprising that he’d do that (and the same applies to Biden). Shame that he doesn’t have the courage to do the same with Russia though, even if that’s more because Russia has held Brazil’s agricultural market by the balls for a while now.