Local Mode is a feature of Firefox Developer Tools documented on the official Firefox Source Docs site. It allows developers to load local files in the browser and map them to remote URLs, making it possible to debug local resources as if they were served from a live site.
The page covers what Local Mode is, how to enable and use it, the file URL loading notification, and how to manage mappings through preferences. It also links to related DevTools documentation such as the Page Inspector and Web Console.
This documentation is intended for web developers and Firefox users who are already comfortable with Developer Tools and want a precise reference for local file debugging workflows. Beginners may need to consult broader DevTools guides first.
To use it effectively, enable Local Mode in DevTools settings, add mappings for the files you want to test, and watch for the file URL notification. Use the preferences panel to review or remove mappings when they are no longer needed.
Overall, this page is a concise official reference for developers who need to debug local files within Firefox DevTools.
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