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Firefox Page Info window
The Firefox "Page Info" window gives you details about the page you're on. You can also use it to change permissions for the website.
How to troubleshoot security error codes on secure websites
Learn about the error codes SEC_ERROR_UNKNOWN_ISSUER MOZILLA_PKIX_ERROR_MITM_DETECTED and ERROR_SELF_SIGNED_CERT on HTTPS websites and how to troubleshoot.
Captive portal detection
Page that describes how Firefox detects captive portal networks.
Add-on Badges
You’ll know if an extension is being regularly reviewed if it has one of the badges listed in this article.
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