For the money they are (were I guess) handed to set that it’s clearly worth it.

Not disagreeing with you. I just want to point out that Google is probably deliberately “overpaying” on this Mozilla deal, because they want to keep Firefox afloat, because they don’t want to catch a court ruling that they are monopolizing the browser market too.

Dirty tricks with web browsers is the antitrust charge that actually caught Microsoft in the 90s.