Forge tunnel for CustomUI is not working (NS_ERROR_CONTENT_BLOCKED)

[JoshuaHwang]

Hi I think I’ve seen this problem before.

Would you be able to let me know if this solution works for you?

Forge Custom UI default hello world app with Custom UI does not work

Hi again, the team mentions adding the following to your manifest. It appears firefox blocks websockets permissions: external: fetch: client: - 'ws://localhost:3000'