Earlier quoted context omitted.
I wish someone from Mozilla or MS would comment on this, to be honest. Were they even considered? Historically, I've heard from various sources that Mozilla may not work at the same pace as some of the large corporations do in upstreaming patches and releases to the code base. This has (according to what I have heard, which may simply rest on rumor/speculation/heresey, mind you) kept a lot of large entities from gett…
microsoft switched to chromium because they want better control/integration with electron apps and the windows store. firefox wasn't on the table for them.
https://developer.microsoft.com/en-us/windows/pwa
I also am willing to surmise that they are going to put in alot of work re-working all their APIs that are exposed as Edge based interfaces into whatever engine they and up with here (namely chromium), so I don't think it would have been beyond them to put in the work to do something like they did with node and chakra core:
https://github.com/nodejs/node-chakracore
(which, btw, for now isn't dead: https://github.com/Microsoft/ChakraCore/issues/5865 likely for the reasoning I mentioned above)
I just don't buy it. I don't think easy electron compatibility is the main drive here.