I&#x27;m curious how this behaves in relation to blocking third-party cookies via Settings→Privacy→Accept third-party cookies: Never. I&#x27;ve had this turned on for a year or so.<p>Also, I wonder what this would catch that uBlock Origin wouldn&#x27;t? I assume that if it&#x27;s &quot;good enough&quot; then it&#x27;s probably the better solution to use in Firefox, especially  with the new extension format and multi-process (e10s) coming eventually in Firefox.