Try one of these articles:
- How to clear the Firefox cache The Firefox cache temporarily stores images, scripts and other parts of websites you visit. Learn how to clear it to fix issues with how websites work or look.
- Websites say cookies are blocked - Unblock them This article describes how to troubleshoot problems that involve websites reporting that cookies are blocked or disabled.
- Firefox Sync troubleshooting and tips If you've run into a problem getting Firefox Sync to work correctly, this article will walk you though the most common solutions.
- 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.