CF Forecast di Ben Bonacci

About
CF Forecast is a Firefox extension that checks if the currently visited website is using Cloudflare's proxy CDN network.

How it works
All Cloudflare proxied websites have a /cdn-cgi endpoint, most notably the trace endpoint. To learn more, it is recommended to read the documentation from Cloudflare.
This extension queries the current website's /cdn-cgi/trace endpoint and checks if the content matches what Cloudflare would serve. If it does, then it can be assumed that Cloudflare is in use for that site.