Firefox Local Mode
Quick read
A Firefox DevTools feature that maps local folders to custom https:// origins so you can load local files without running a web server. Use it to test secure-context Web APIs and keep separate origins/storage per project while DevTools is open.
- Register mappings from DevTools Options to expose folders via https origins
- Use Add To Settings or Try it when loading file:// URLs in DevTools
- Manage or import mappings via about:config preferences
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Firefox Local Mode was shared on NexURLs by Nexis on November 4, 2026, in Tools.
What we found on this site
- Served through
- Amazon CloudFront
- Home page answered in
- 98 ms
- Trackers
- None found
- Ads
- None found
- RSS feed
- No
- Set up for phones
- Yes
- Real-visitor speed
- Passes Core Web Vitals
- Popularity
- Top 200 domain (Cloudflare)
- Google safety check
- No threats found
- Domain registered
- 1998
- Domain renews
- January 2027
Checked November 4, 2026 from the site’s own code and public records. See how the rest of the web compares in the NexURLs Internet Report.
Quick answers
What is Firefox Local Mode?
Firefox Local Mode (firefox-source-docs.mozilla.org): A Firefox DevTools feature that maps local folders to custom https:// origins so you can load local files without running a web server. Use it to test secure-context Web APIs and keep separate origins/storage per project while DevTools is open.
Who shared Firefox Local Mode on NexURLs?
It was shared by Nexis in November 2026. Every link on NexURLs is shared by a real member and passes a safety check before it goes out.
What are some sites like Firefox Local Mode?
Members found these close to it: Introducing Firefox Enterprise, BrowserLeaks, Learn HTML, CSS, JavaScript for Free. The full list is on this page under Sites like Firefox Local Mode.
Sites like Firefox Local Mode
- Introducing Firefox Enterpriseblog.mozilla.org
- BrowserLeaksbrowserleaks.com
BrowserLeaks is a collection of browser tests that evaluate security and privacy, revealing what information websites...
- Learn HTML, CSS, JavaScript for Freehtmldog.com
This site offers free resources to learn HTML, CSS, and JavaScript. It's ideal for anyone looking to enhance their web...
- WebPageTestwebpagetest.org
- PrivacyTestsprivacytests.org
- Cover Your Trackscoveryourtracks.eff.org
A free diagnostic tool from the EFF that shows how trackers and fingerprinting see your browser. Visit to learn what...
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