How to enable electrolysis for Firefox beta? They're testing it right now via A/B testing on this feature so it's there. It should be possible to enable it manually (certainly through about:config) but I didn't find anything that actually works for Firefox Beta 44.
Mozilla document on https://wiki.mozilla.org/Electrolysis how to enable electrolysis for Nightly build, but not for beta.
EDIT: It's now documented on https://wiki.mozilla.org/Electrolysis#Enabling_and_Disabling_Electrolysis_on_Beta
Best Answer
In about:config (see http://kb.mozillazine.org/About:config to learn how to use "about:config")
Set
browser.tabs.remote.autostarttotrueOn your next restart, e10s should be active. To verify that it is active, go to about:support and look for a number higher than 0 in "Multiprocess Windows".