Cloudflare performs a number of checks on the request and the browser that Chameleon can not protect against. Simply changing your user agent to Chrome can cause a captcha loop. Sites that use Cloudflare should be whitelisted with a Firefox profile/real profile.

https://accounts.google.com

Chameleon does not spoof anything when accessing a URL that starts with accounts.google.com. More details can be found here.

https://accounts.youtube.com

Chameleon does not spoof anything when accessing a URL that starts with accounts.youtube.com. More details can be found here.

https://disqus.com/embed/comments/

Chameleon does not spoof the iframe when accessing embedded Disqus comments.

https://www.google.com/recaptcha/api2

Recaptcha is already inconvenient with regular Firefox, it becomes almost impossible when Chameleon is enabled.

https://docs.google.com/

Timezone spoofing breaks Google Docs. Non-Firefox profiles may also cause issues.

https://drive.google.com/

Timezone spoofing breaks Google Drive. Non-Firefox profiles may also cause issues.