I’m going off-topic, but I am eager to find a solution to my issue, even if that would mean using Chrome to view the dashboards in the future.
I changed “Insecure content” to allow in Chrome, but the security camera feed still doesn’t show in the tile setup or the dashboard when using Chrome. What is strange is if I use the same url I use in the Media Tile setup directly in Chrome, the video feed of the camera works fine.
I’m using Tiny Camera web server as the source for the camera feed. Https is not enabled in Tiny Cam, because according to this post, that will in any event not help. (Just to be clear, the same url works fine in both the Media Tile setup and in a dashboard.)