> As of Firefox 54+ (early 2017), our Multi-Content process model is currently being tested on Nightly (4 processes). Four content processes will be enabled on 54 Aurora and if stable enough, we will begin to roll it out in Firefox 54 Beta experiments.
This seems to be the case because I downloaded Firefox 53 for the first time on my new MacBook Pro and e10s wasn't enabled. I had to go to about:config and enable it manually.
This seems to be the case because I downloaded Firefox 53 for the first time on my new MacBook Pro and e10s wasn't enabled. I had to go to about:config and enable it manually.