Describe the bug
The issue persists from the original Mr. Crayfish mod. The TV either displays an untrusted domain error or a not a gif error

To Reproduce
If applicable, the steps to reproduce the behavior:

1. Place Modern TV
2. Right click TV
3. Add URL: https://i.imgur.com/GpFlgWu.gif
4. See error: Untrusted Domain

Screenshots

Please complete the following information:

• Minecraft Version: 1.12.2
• Mod Version: 6.5.0

Maybe relevant to this?

Yeah, it's possibly related to an invalid/outdated user agent string.