LocalCDN is 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 look at the graphic below or read the tutorial or our Wiki pages. You can also download the extension directly from Mozilla and just try it.

LocalCDN includes a huge number of libraries and supports many CDNs!


Content Delivery Networks:

  • ajax.googleapis.com
  • ajax.aspnetcdn.com
  • ajax.microsoft.com
  • cdnjs.cloudflare.com
  • code.jquery.com
  • cdn.jsdelivr.net
  • fonts.googleapis.com
  • yastatic.net
  • yandex.st
  • cdn.bootcss.com
  • stackpath.bootstrapcdn.com
  • maxcdn.bootstrapcdn.com
  • netdna.bootstrapcdn.com
  • use.fontawesome.com
  • ajax.cloudflare.com
  • mathjax.rstudio.com
  • unpkg.com
  • ...
  • Show all supported CDNs at Codeberg

If you have found an unsupported Library or CDN, feel free to open an issue at Codeberg or send an email.

LocalCDN (HTML filter off)

The Replacement of Libraries

LocalCDN (HTML filter on)

The Replacement of Libraries

Other CDN emulators

The Replacement of Libraries

Interested? Then download the extension from Mozilla Add-ons:

Source Code @Codeberg Contact Testing Utilities
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