Performance and connectivity

How to troubleshoot time related errors on secure websites

Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.

Last updated: 3/21/24

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.

Last updated: 7/27/23

Websites don't load - troubleshoot and fix error messages

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.

Last updated: 12/17/21

Resist Fingerprinting

Firefox's Advanced Preferences to resist fingerprinting can help prevent websites from uniquely identifying your device but can cause problems. Learn more.

Last updated: 4 weeks, 1 day ago

Websites look wrong or appear differently than they should

This article explains how to fix problems with websites that display incorrectly in Firefox or don't work the way they should.

Last updated: 7/31/24

Firefox can't load websites but other browsers can

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.

Last updated: 7/7/22

Fix login issues on websites that require a username and password

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.

Last updated: 1/11/19

Configure firewalls so that Firefox can access the Internet

A firewall controls what programs can access the Internet. Find information about configuring your firewall to allow Firefox access to the Internet.

Last updated: 2/21/22

Troubleshoot issues related to add-ons

Add-ons can cause issues in Firefox. This article provides more information on how you can troubleshoot Firefox issues related to add-ons.

Last updated: 5/29/21

Firefox and other browsers can't load websites

If no web browsers on your computer can load websites, it indicates a problem with your Internet connection. The article describes some troubleshooting methods.

Last updated: 11/26/16

Websites show a spinning wheel and never finish loading

Sometimes a website will start to load, but never finish. This article covers possible solutions.

Last updated: 12/4/19

Fix problems connecting to websites after updating Firefox

Learn to troubleshoot and fix problems connecting to websites that start immediately after updating to a new version of Firefox.

Last updated: 7/18/14

How to fix Pocket login issues

Learn how to add an exception for Pocket in Firefox, to prevent being prompted to sign in to Pocket when saving to the site.

Last updated: 10/25/23

Fix problems with Facebook games, chat and more

This article describes how to troubleshoot problems, like those with games or chat, that you might encounter while using Facebook in Firefox.

Last updated: 6/25/21

TLS Error Reports

Firefox TLS Error Reports; what they are and why you might want to share yours.

Last updated: 1/20/16

Problems with email and how to find help

Find out the right direction to get help using webmail in Firefox and links to support pages for popular web-based email services.

Last updated: 6/22/15

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