The bug in question is that if a user opts into allowing one tracker on a given
site for the session, new visits to that site will allow others trackers as
well, not just the expected one.
While we're here, we also improve the web console messages to show the same
"allowing X due to opt in" message on new visits as well, not just the original
one where the user initially opted-in for that shim.
We might as well also land bug 1712959 into m-c, rather than waiting for the
next webcompat release cycle.
Differential Revision: https://phabricator.services.mozilla.com/D116642
8ac7025506