Welcome!

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!

Libraries:

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)

How LocalCDN works when the HTML filter is disabled: If the frameworks are supported, you can upgrade to a higher version if necessary. If crossorigin/integrity attributes are present, the frameworks cannot be replaced. Non-existing frameworks can be loaded from the CDN depending on the configuration.

LocalCDN (HTML filter on)

How LocalCDN works when the HTML filter is enabled: If the frameworks are supported, an upgrade to a higher version can be performed if necessary. If crossorigin/integrity attributes are present, the frameworks can be replaced. Non-existing frameworks can be loaded from the CDN depending on the configuration.

Other CDN emulators

How other CDN emulators work: If the frameworks are not present one-to-one in the extension, the frameworks cannot be replaced. If crossorigin/integrity attributes are present, the frameworks cannot be replaced. Non-existing frameworks can be loaded from the CDN depending on the configuration.

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

Source Code @Codeberg Contact Testing Utilities