manifest.json is usually irrelevant to your extension in most casts. The Dev rig is loading something else for another purpose
Since it’s the manifest in question is being served on port 60060 which is nothing to do with your extension being served from port 3000
Check the network tab for 404 errors
Is your hosting/paths/URL’s correctly configured in the Twitch Console? (Asset Hosting)
If you have updated the extension settings in the Twitch Console make sure to hit
To make sure your Rig has the right settings.
if you did updated anything and your view is not working still, delete and recreate the view