Thanks for this, I added it to everywhere I use uBlock Origin.

In case anyone was wondering, here's more info: https://github.com/gorhill/uBlock/wiki/Strict-blocking

This only works at blocking full domains starting from uBO v0.9.3.0. Latest version is v1.58.1, so it's safe to assume most people are up to date. But noting it just in case.

https://github.com/gorhill/uBlock/releases

Its already been blocked by Ublock filters - badware risks: https://github.com/uBlockOrigin/uAssets/blob/master/filters/...

edit:DNS servers for Cloudflare, Quad9, Google and Level3 all cname cdn.polyfill.io to Cloudflare domains.

I assume those are the alt endpoints that Cloudflare setup in Feb. Lots of folks seem to be protected now.

Cloudflare notice: https://blog.cloudflare.com/polyfill-io-now-available-on-cdn...

Feb discussion: https://github.com/formatjs/formatjs/issues/4363

(edit:withdrawn) For my use cases, I made the local DNS servers authoritative for polyfill.io. Every subdomain gets a Server Failed error.

Might work for pihole too.

Might as well block googie-anaiytics.com while you're at it

I just set polyfill.io to Untrusted in NoScript.

Just added to my pihole.