A website can use the Cloudflare Web Application Firewall (WAF) to protect itself against attacks and abuse, you may need to complete a challenge to proceed and create a special cookie, similar to a reCAPTCHA challenge. If this challenge page keeps reloading then this means that the script isn't working properly and is not able to create this cf_clearance cookie. This can happen if you block cookies or have an extension that blocks cookies. More info: *https://support.cloudflare.com/hc/en-us/articles/200170136-Understanding-Cloudflare-Challenge-Passage-Captcha-