JSONView not letting a page render when its URL has .json in the end and response is HTML.

[Madhur Ahuja]

NPM JS using a package documentation page does not work when JSONView extension is enabled.

For reference-
https://github.com/npm/docs/issues/722

[Gildas]

This issue cannot be fixed AFAIK because there is no generic way to find the JSON contents in the page.