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[jcoyne]

I believe this only shows up in Firefox (tested 125 on Mac), when looking at a "Stanford-only" object like https://purl.stanford.edu/nm886yc3832

Clicking the "Log in" button resolves it:

[dnoneill]

This is happening because the viewer is trying to preload the video which it can't access. We can get rid of this by adding setup: {"preload": "none"} to the def media_tag element under data. The problem is that it looks to be playable which isn't a great UI experience. Think this might need a little design before being put into practice. At the very least an overlay that doesn't allow the user to click on the viewer.

View with preload none

View after clicking on the image