Wikipedia is one of the most-used websites on the planet and they raise ~$90 million a year. That's still only like ~20% of what Mozilla brings in, and I find

Wikipedia is one of the most-used websites on the planet and they raise ~$90 million a year. That's still only like ~20% of what Mozilla brings in, and I find it unlikely that Mozilla could ever raise that much without driving away users with the annoying ads. That's not a problem for wikipedia because there's hardly a replacement for wikipedia, but there's tons of replacement browsers.