"Disabled" means there was an explicit pref set to disable it. I can't tell from over here what preferences you changed and in what order and when. You said "

"Disabled" means there was an explicit pref set to disable it. I can't tell from over here what preferences you changed and in what order and when. You said "I had to go to about:config and enable it manually"... did you restart after that? e10s pref changes require a restart to take effect. What was the state of the preferences before you did that, if you remember? In any case, glad to hear it's working for you now.