I recently noticed addons.mozilla.org also tracks links using this method. If you scroll down to "Add-on Links" the links to "Homepage" and "Support site" go to

  https://outgoing.prod.mozaws.net/v1/8a4c4de845953bc85d10c6465c5c0f11210b5ca1c195b70d7ddfcf8b74592477/https%3A//clearurls.xyz/

and

  https://outgoing.prod.mozaws.net/v1/8a4c4de845953bc85d10c6465c5c0f11210b5ca1c195b70d7ddfcf8b74592477/https%3A//wiki.clearurls.xyz/

respectively, instead of going to the page directly.

Why Mozilla? Why are you tracking us ? Of all the pages...