Failed to load resource:400 ()

Open up the browser dev tools and debug your website.

Extensions are just websites so normal website debugging applies.

You declared a 400 but you didn’t state what was 400ing

I suspect your CSS/JS is whats 400-ing as you used an aboluste link/reference to the JS/CSS in your HTML instead of a relative one as extensions upload to a sub folder.

Or you didn’t state the html to load was index.html in the dev console.

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