Mozilla has been an advertising company since 2004 when Google was first made the default search engine in the browser—where do you think the money Google paid for that came from? The ads on the search results! Mozilla has been almost fully funded by advertising revenue for two decades.
If you're surprised and worried for what this means you should've switched to a fork when Mozilla was directly negotiating with advertisers to standardize Do Not Track in 2010. "Advertising is the only thing that anyone has made work at scale so let's try and make advertising better until we find a better funding model" has been a Mozilla core principle for over 14 years.
His impact in helping to create Mozilla and Firefox is inarguable, but boy do I hate the way he writes about things and hate how much he loves easy, out-of-context dunks.

