Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.
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.
Are you having trouble getting a website to load? This article will show you how to fix the problem so you can get back to surfing the web.
We'll explain errors such as "Server not found" or "Unable to connect" and how to fix problems where Firefox can't access websites but other browsers can.
A firewall controls what programs can access the Internet. Find information about configuring your firewall to allow Firefox access to the Internet.
If no web browsers on your computer can load websites, it indicates a problem with your Internet connection. The article describes some troubleshooting methods.
This article describes how to troubleshoot problems, like those with games or chat, that you might encounter while using Facebook in Firefox.
Learn to troubleshoot and fix problems connecting to websites that start immediately after updating to a new version of Firefox.
Learn how to add an exception for Pocket in Firefox, to prevent being prompted to sign in to Pocket when saving to the site.
This article explains how to fix problems with websites that display incorrectly in Firefox or don't work the way they should.
Sometimes a website will start to load, but never finish. This article covers possible solutions.
If you find that you can't log in to a website that requires a username and password, follow the steps described in this article.
Firefox TLS Error Reports; what they are and why you might want to share yours.
Add-ons can cause issues in Firefox. This article provides more information on how you can troubleshoot Firefox issues related to add-ons.
Find out the right direction to get help using webmail in Firefox and links to support pages for popular web-based email services.