CloudFlare relies on it in key projects, which is why I feel like if I had to pick any tech company to consider taking a hold of Firefox, they'd be my top pick. I know some people are skeptical of them, but they have not goofed yet. Maybe if the CEO ever steps down I'll change my views on CF.
Yeah if you’re going to scope it to browsers alone, sure but Google is catching up. They just implemented JPEG-XL as a rust library for Firefox to use too, for example. Nothing at the scale of Stylo but it seems to be accelerating.