Earlier quoted context omitted.
The only thing missing from this announce is the promise that all proceeds go to MDN and nowhere else, like subsidizing a failing product or paying C-suite bonuses.
Ring fencing funds could be a real issue for Mozilla. They desperately need new revenue streams to support their primary product (the Firefox browser) since it's non- revenue earning. I wouldn't mind these funds going towards Firefox, or even other products woth a little reluctance, but agree they shouldn't go towards other costs like bonuses or "operation costs".
Isn't Firefox by far the largest revenue earning product they have? It currently generates revenue of $400-450 million a year through the sale of the default search engine within the browser.