The ‘factory default’ widgets ‘Register a new MangOH’ & ‘Welcome to your Sierra AirVantage account’ on the AirVantage portal point to HTTP served images. Which annoys the browser since all other calls are done HTTPS only. This is shown by the user in Firefox as a grey SSL padlock with a yellow exclamation mark.
Removing the widgets seems to fix the warnings.
Re-adding the ‘Register a new MangoOH’ using the portal edit features brings back a different widget, which do make proper HTTPS calls. I cannot find the ‘Welcome to your Sierra AirVantage account’ widget anymore.