firefox multi-process

After 11 years of first multi-core x86 processor, yes, 11-years, firefox start to supported multi-processor, even only supported two of processor.

reference from here:
http://www.ghacks.net/2016/07/22/multi-process-firefox/

1. Enable electrolysis
• in firefox "about:config"
• search "browser.tabs.remote.autostart"
• setting to "true"
2. Tabs remote enable:
• in firefox "about:config"
• search "browser.tabs.remote.force-enable" (if not, create it, boolean)
• setting to "true"
3. Accessibility enable:
• in firefox "about:config"
• search "accessibility.force_disabled"
• setting to "0"
4. Check:
• in forefox "about:support"
• see option "Multiprocess Windows"

but, even now, I only see two of firefox task in the task-manager.