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Decentraleyes is worth mentioning. Also save some bandwidth.

https://addons.mozilla.org/en-US/firefox/addon/decentraleyes...

Isn't the point of these CDNs that you only have to make the request once, and then it's cached forever? What does decentraleyes buy you?

Few things

- You request once _per CDN_. Common libraries are hosted on multiple CDNs and you may simply load them from multiple locations. For example jQuery is hosted by MaxCDN, Google, Microsoft, Cloudflare, jsdelivr.

- Some CDNs may be temporarily down. It happened for me already multiple times, including Google CDN and Cloudflare CDN.

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