gorhill added a commit to gorhill / uBlock that referenced this issue
Related issue: -uBlockOrigin / uBlock-issues # 780New webext permission added: `dns`, which purpose is to allow an extension to fetch the DNS record of specific hostnames, reference documentation:https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/dnsThe webext API `dns` is available in Firefox 60 only. The new API will enable uBO to "uncloak" the actual hostname used in network requests. The ability is currently disabled by default for now - this is only a first commit related to the above issue to allow advanced users to immediately use the new ability. Four advanced settings have been created to control the uncloaking of actual hostnames: cnameAliasList: a space-separated list of hostnames. Default value: unset=>empty list. Special value: *=>all hostnames. A space-separated list of hostnames=>this tells uBO to "uncloak" the hostnames in the list will. cnameIgnoreList: a space-separated list of hostnames. Default value: unset=>empty list. Special value: *=>all hostnames. A space-separated list of hostnames=>this tells uBO to NOT re-run the network request through uBO's filtering engine with the CNAME hostname. This is useful to exclude commonly used actual hostnames from being re-run through uBO's filtering engine, so as to avoid pointless overhead. cnameIgnore1stParty: boolean. Default value: true. Whether uBO should ignore to re-run a network request through the filtering engine when the CNAME hostname is 1st-party to the alias hostname. cnameMaxTTL: number of minutes. Default value: 120. This tells uBO to clear its CNAME cache after the specified time. For efficiency purpose, uBO will cache alias=>CNAME associations for reuse so as to reduce calls to `browser.dns.resolve`. All the associations will be cleared after the specified time to ensure the map does not grow too large and too ensure uBO uses up to date CNAME information.