Consider blocking cdn.polyfill.io due to supply chain attack

TL;DR: A malicious company bought the polyfill.io domain and is using cdn.polyfill.io to selectively redirect clients to a sports betting site. This apparently has affected an enormous number of sites.

Report here: https://sansec.io/research/polyfill-supply-chain-attack

Please consider adding cdn.polyfill.io to the block list.

Thanks!