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To test out of process extensions, go to about:config and set extensions.webextensions.remote to true. Note: after flipping this pref it shouldn't require a restart, but it might not run reliably without one, so just restart Firefox ok?

APIs that are particularly affected by out of process:

  • context Menus
  • devtools
  • omnibox
  • tabs
  • permissions
  • webRequest

For more information see this etherpad