They either don&#x27;t sandbox at all or they backported the new 64-bit NPAPI Sandbox from Mozilla:<p><a href="https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=1185532#c29" rel="nofollow">https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=1185532#c29</a>