Idunno, I have a near-total lack of confidence in their engineering. I reported a Firefox bug six years ago and I may as well not have. It's still there for everyone.
Nobody there seems to believe anything in a way that puts fire in their belly. They pick 8 directions and then discover they have no commitment to any of them.
If I want to see the world changed, I've decided that I have to do it not wait for Mozilla