unfortunately, it's close to useless in 2026. i'll take an excerpt from arkenfox's repo as to why:
> Replacing some version specific scripts on CDNs with local versions is not a comprehensive solution and is a form of enumerating badness. While it may work with some scripts that are included it doesn’t help with most other third party connections.
> CDN extensions don't really improve privacy as far as sharing your IP address is concerned and their usage is fingerprintable as this Tor Project developer points out. They are the wrong tool for the job and are not a substitute for a good VPN or Tor Browser. Its worth noting the resources for Decentraleyes are over six years out of date and would not likely be used anyway
> Replacing some version specific scripts on CDNs with local versions is not a comprehensive solution and is a form of enumerating badness. While it may work with some scripts that are included it doesn’t help with most other third party connections.
> CDN extensions don't really improve privacy as far as sharing your IP address is concerned and their usage is fingerprintable as this Tor Project developer points out. They are the wrong tool for the job and are not a substitute for a good VPN or Tor Browser. Its worth noting the resources for Decentraleyes are over six years out of date and would not likely be used anyway
https://github.com/arkenfox/user.js/wiki/4.1-Extensions