James W

Looks like you can add custom domains in about:config as a true boolean with browser.fixup.domainwhitelist.yourdomain.yoursuffix. Just needs to be full domain with tld.

https://bugzilla.mozilla.org/show_bug.cgi?id=1634650

https://support.mozilla.org/en-US/questions/1285922

I couldn’t get this link to work, but this appears to be the same thing (Live Sea Otter Cam - Monterey Bay Aquarium) https://www.youtube.com/watch?v=hHbp9hG61CQ