=== Nightly/Aurora ===
If you're on Nightly or Aurora, e10s is already enabled by default! A user -facing checkbox is available for controlling Electrolysis functionality. Open Preferences and check the "Enable multi-process" checkbox and then restart your browser:
[[File:E10s-toggle-in-preferences.png|324x150px|frameless|Nightly > Preferences > General > Enable multi-process]]