Fix slowness, crashing, error messages and other problems
Fix problems with websites (Facebook, YouTube, webmail etc.)
- How to troubleshoot "Your connection is not secure" 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.
- How to troubleshoot time related errors on secure websites This article explains why you might see time-related errors on HTTPS websites and how you can troubleshoot them by correcting your system clock.
- 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.
- Websites look wrong or appear differently than they should This article explains how to fix problems where a website doesn't look like it normally does or does not load correctly.
- 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.
- Websites show a spinning wheel and never finish loading Sometimes a website will start to load, but never finish. This article covers possible solutions.
- 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.
- 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.
- 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.
- 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.
- 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.
- Unable to log in to websites that use signText on Firefox How to resolve login issues if your bank still uses a non-standard digital certificate (SignText) that Firefox no longer supports.
- Some websites won't load after updating to Firefox version 51 Websites that use two types of certificates, WoSign and StartCom, will no longer work with major browsers, including Firefox. Learn more.
- 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.