Maybe firefox should become more like microsoft and amazon and instead of monetizing the browser become a bigger competitor to google et al viz vi cloud services. They also could build products for developers to use for browser testing across multiple platforms, etc...
I don't see premium firefox taking off, but more competition with AWS, Azure, GCP is never a bad thing, or maybe they do something like Brave Browser and merge crypto with browsing though that seems tenuous compared to some other options.