Mozilla really should be as aggressive as it possibly can be about Servo and rewriting other core components in Rust. This is what will give Firefox that new "fresh look" that Firefox is in dire need of. If they do this and they do it quickly I guarantee both developers and users will start actually being excited about Firefox again, as opposed to content at best (mainly because it's what they were already using or have a radical anti-Google stance, despite all the security benefits of Chrome compared to Firefox right now).

In my opinion, Mozilla shouldn't have even tried to implement Electrolysis in Firefox and shouldn't have announced a switch to WebExtensions in it either. Instead, it should've done what Microsoft did and create a new browser in Rust from scratch, with a much cleaner, easier to maintain codebase that would also be much more secure in the long term.

I don't know if Mozilla's funding would even allow for that, but I think that would've been the better strategy. The putting lipstick on a pig usually doesn't work, and it usually pisses off those who preferred the way the pig looked before, too, causing said platform to lose both old and potentially new users.