Their support isn’t required though, it’s desired.

Mozilla have millions of $, they are actively investing in various money making schemes (sorry, financial investment vehicles) well outwith the original scope of Mozilla.

They take the money because they want the money, they could refuse it any time they want. But they won’t, because they don’t want to. They’re not a poor FOSS project with an independent developer that needs donations to survive, stop treating them like they are.

Mozilla has created some brilliant software, but they’re leaving their original mission behind, burning goodwill with many people around the world, and setting themselves up to be shunned by the open source community the second a viable alternative pops up.