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LocalCDN is a fork of Decentraleyes and a web browser extension that emulates Content Delivery Networks to improve your online privacy. It intercepts traffic, finds supported resources locally, and injects them into the environment. All of this happens automatically, so no prior configuration is required. Feel free to use the following testing utility to find out if you are properly protected. For more information, please read the tutorial or the Wiki. You can also download the extension directly from Mozilla and just try it.
What are the advantages?
- Supports cloud storage by browsers sync feature (Firefox Sync or own Sync-Server) if enabled
- Removes integrity and crossorigin tags from embedded script and style elements to replace even more frameworks
- Font Awesome
- Google Material Icons
- Bootstrap CSS
- AngularJS, AngularJS-Animate, AngularJS-Sanitize, AngularJS-Cookies and AngularJS-Touch
- React, Vue.js, Chart.js and many other frameworks/libraries
- MathJax (minimal)
- TinyMCE (without plugins)
- Internal statistics about CDNs and frameworks (day, week, month, year)
- Export/Import your config
- Prepared rules for uBlock Origin, uMatrix, AdGuard and NoScript
Note: LocalCDN is no silver bullet, but it does prevent a lot of websites from making you send these kinds of requests. Ultimately, you can make LocalCDN block requests for any missing CDN resources, too.
How does it work?
LocalCDN uses redirection for certain requests. There is a mapping file that lists the source (all CDNs and the path to the frameworks) and a resource file that defines the destination.
An adblocker (e.g. uBlock Origin, uMatrix or AdGuard) decides which requests are allowed. Only if your adblocker allows a request, it will be intercepted by LocalCDN. LocalCDN catches the request after an adblocker and not before.
What's the different of LocalCDN in comparison to other CDN emulators?
LocalCDN with activated HTML filter (optional)
Other CDN emulators
⚠️ Important ⚠️
Rule generator for uBlock Origin, uMatrix and AdGuard (after an update)
Suggestions in the form of Issues, and contributions in the form of Merge Requests, are highly welcome.
- Mozilla Firefox (86 or higher): get it on addons.mozilla.org
- Firefox for Android: It's possible. Please read here.
- Chromium based browser: Chrome Web Store (by Emanuel Bennici) ⚠️ Please note this Wiki article FAQ: Chromium incompatibilities ⚠️
Running the Code as temporary extension
Please read this guide to run the extension from source.
Important: All tagged commits are signed with GPG. It's likely best to ignore unsigned commits, unless you really know what you're doing. Please send an email if you have any questions or security concerns.
Just open an issue with your question or write an email (PGP possible!).
The language you want is not completely translated or you are a language talent? Please help us by translating this add-on on Weblate.
LocalCDN is free and open-source. If you like LocalCDN you can support continued development by making a donation. Any help would be greatly appreciated!
DE22 5003 1000 1069 4660 16(BIC:
- Color Picker (Taufik Nurrohman, https://github.com/taufik-nurrohman/color-picker, MIT License)