Discussion Firefox 153 adds DevTools Local Mode...

15 Upvotes

"A new "Local Mode" setting in the options panel allows developers to load local directories via custom origins. This simplifies testing for APIs that do not function over standard file:// URLs, removing the need to run a local web server. Multiple directory mappings are supported."

More information in Release Notes' 'Developer Information' section... and MDN's article 'Local Mode'.

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