Cookie law related, perhaps? There was a cookie-related change in FF43 for third-party cookies (https://bugzilla.mozilla.org/show_bug.cgi?id=536509 https://bugz

Cookie law related, perhaps? There was a cookie-related change in FF43 for third-party cookies (https://bugzilla.mozilla.org/show_bug.cgi?id=536509 https://bugzilla.mozilla.org/show_bug.cgi?id=536509).