I’m not sure if the specifics but I think embedding an alternative rendering engine within a browser already built around a different one would be a significant

I’m not sure if the specifics but I think embedding an alternative rendering engine within a browser already built around a different one would be a significant chunk of work. I could imagine a sort of quirks mode though, just a few hand selected chrome bugs/features implemented in gecko to make it behave just a little more like chrome. What a horrible future but it’s a possibility.