What problems do you have with CAPTCHA challenges ? You may have to disable Enhanced Tracking Protection or check for issues with content blocking extensions if you do not see the challenge. *https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop *https://support.mozilla.org/en-US/kb/total-cookie-protection-and-website-breakage-faq *https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track