[](https://hosted.weblate.org/projects/localcdn/localcdn/) [](https://codeberg.org/nobody/LocalCDN/src/branch/main/core/mappings.js) [](https://codeberg.org/nobody/LocalCDN/src/branch/main/resources/) [](https://addons.mozilla.org/en-US/firefox/addon/localcdn-fork-of-decentraleyes/) [](https://www.buymeacoffee.com/LocalCDN) [](https://opencollective.com/LocalCDN)
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](https://www.localcdn.org/test/) to find out if you are properly protected. For more information, please read the [tutorial](https://www.localcdn.org/tutorial) or the [Wiki](https://codeberg.org/nobody/LocalCDN/wiki). You can also [download](https://addons.mozilla.org/en-US/firefox/addon/localcdn-fork-of-decentraleyes/) the extension directly from Mozilla and just try it.
* Supports cloud storage by browsers sync feature (Firefox Sync or own Sync-Server) if enabled <imgwidth="15px"src="https://www.localcdn.org/img/icon-firefox-25.png"><imgwidth="15px"src="https://www.localcdn.org/img/icon-chrome-25.png">
* Removes integrity and crossorigin tags from embedded script and style elements to replace even more frameworks <imgwidth="15px"src="https://www.localcdn.org/img/icon-firefox-25.png">
* Font Awesome <imgwidth="15px"src="https://www.localcdn.org/img/icon-firefox-25.png">
* AngularJS, AngularJS-Animate, AngularJS-Sanitize, AngularJS-Cookies and AngularJS-Touch <imgwidth="15px"src="https://www.localcdn.org/img/icon-firefox-25.png"><imgwidth="15px"src="https://www.localcdn.org/img/icon-chrome-25.png">
* React, Vue.js, Chart.js and many other frameworks/libraries <imgwidth="15px"src="https://www.localcdn.org/img/icon-firefox-25.png"><imgwidth="15px"src="https://www.localcdn.org/img/icon-chrome-25.png">
* Export/Import your config <imgwidth="15px"src="https://www.localcdn.org/img/icon-firefox-25.png"><imgwidth="15px"src="https://www.localcdn.org/img/icon-chrome-25.png">
> **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.
LocalCDN uses redirection for certain requests. There is a [mapping file](https://codeberg.org/nobody/LocalCDN/src/branch/main/core/mappings.js#L71) that lists the source (all CDNs and the path to the frameworks) and a [resource file](https://codeberg.org/nobody/LocalCDN/src/branch/main/core/resources.js#L328) that defines the destination.
Currently only JavaScript and CSS files are redirected. However, some CSS files internally refer to other files, e.g. Font Awesome. All requests are redirected to a local file, e.g. [jQuery](https://codeberg.org/nobody/LocalCDN/src/branch/main/resources/jquery). This is the reason why the extension is over 17 MB in size. Only if LocalCDN cannot find a local resource (and the option is enabled), a request will be blocked.
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.
[<img src="https://codeberg.org/nobody/LocalCDN/raw/branch/main/screenshots/replacement_html_filter_on.png" alt="LocalCDN with activated HTML filter (optional)" width="500"/>](screenshots/replacement_html_filter_on.png)
In some cases, LocalCDN is not allowed to replace requested resources because the website sets up a strong Same Origin Policy (SOP). Please read [Broken JavaScript or CSS on some websites](https://codeberg.org/nobody/LocalCDN/wiki/Home#user-content-7-a-website-looks-weird-or-cannot-be-used-if-i-deactivate-localcdn-everything-works-what-is-the-problem) before opening an issue. [Here](https://www.localcdn.org/test/check) you can also find an online tool to test a website. This test covers the most common causes and provides solutions.
[<img src="https://codeberg.org/nobody/LocalCDN/raw/branch/main/screenshots/screenshot_after_update.png" alt="Rule generator after an update" width="500"/>](screenshots/screenshot_after_update.png)
Please read this [guide](https://codeberg.org/nobody/LocalCDN/wiki/Home#user-content-5-you-recently-changed-something-in-the-code-and-i-would-like-to-test-it-how-do-you-do-that) 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.
The language you want is not completely translated or you are a language talent? Please help us by translating this add-on on [Weblate](https://hosted.weblate.org/projects/localcdn/).
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!
