It seems Firefox is only allowing support for activeinbox up to 6.0.34. Activeinbox are aware of issues with this and have allegedly issued version 6.0.38 into the blackhole that is Firefox and are claiming that they're waiting for you to approve it. https://twitter.com/rivergateuk/status/809020714028269569 I've been pestering in them for weeks about this issue but they keep blaming Firefox for not authorising the update. You guys need your heads knocked together to get this sorted!!!