I think it's not that they don't want it as it's difficult to mix money from commercial activities with donations. That's why they keep the two cash flows separ

I think it's not that they don't want it as it's difficult to mix money from commercial activities with donations. That's why they keep the two cash flows separate and are only using Google money for Firefox development, and spend donations exclusively on political bullshit very few people care about. Although their $7 mil CEO could have found a way to handle this while not running afoul of the IRS, but she decided to play with a bunch of dead-end commercial endeavors instead. So that's on them.