Lose the users lose the funding. Firefox can't live out of HN as its sole userbase. Have you checked how much it costs to build and maintain a modern browser?
Plenty of users who have no money for TV or consoles, watch it on their laptop on low quality. I am one of those who watches Netflix on Linux Firefox :)
This isn't just any risk. It's an existential one for Firefox. You are asking them to make something that would be unpopular to the majority of its userbase at a point when they are borderline extinct. You are asking Mozilla to jeopardise Firefox for the same of a feature that YOU dislike enough to want to burn Firefox to the ground to get rid of it.