Review Cloudflare's Official "Privacy Pass" addon to evaluate inclusion in Tor Browser
https://addons.mozilla.org/en-US/firefox/addon/privacy-pass/ This addon is a design intended to reduce the captcha burden from Cloudflare on users.
PETS 2018 paper: https://petsymposium.org/2018/files/papers/issue3/popets-2018-0026.pdf