There’s an HTML tag <noscript> that you can wrap content in to be shown if the user does not have javascript available. It’s got nothing to do with the NoScript extension.

There's a certain amount of randomness in the output. Just hit try again to get different responses to the same prompt.

It did seem to be random. Hitting 'Reset Thread' and trying again gave me the author's original response back. I wonder what it was in my original thread that caused the model to expect javascript to be disabled.