Mozilla Firefox Help

  If you’re seeing a “SEC_ERROR_EXPIRED_CERTIFICATE” error while browsing any website, you’re not alone! This is a common error that’s associated with a website’s Secure Socket Layer (SSL) certificate. Website owners install an SSL certificate to secure the data that transfers between a website visitor’s browser and website’s server. SSL certificates are issued for a maximum of two years, and they must be renewed before or at the time of its expiry date. If the SSL certificate is not renewed, all web browsers will display the SEC_ERROR_EXPIRED_CERTIFICATE error for that site. A pending SSL renewal is quite a common problem for all types of organizations. More than 80 .gov websites’ SSL/TLS Certificates expired during the most recent US government shutdown. In May 2019, LinkedIn missed renewing its SSL certificate! When such negligence takes place, the website visitors see the “SEC_ERROR_EXPIRED_CERTIFICATE” error message.  Fix Firefox Error Even when an SSL certificate is rene...

All of your personal settings, bookmarks, and other information are kept in your  Firefox profile . Firefox needs an unlocked profile to start up, and if the profile is locked, it displays the message,  Firefox is already running, but is not responding . This article explains what to do if you see this message and how to prevent it from showing at startup. End Firefox processes If Firefox did not shut down normally when you last used it, Firefox might still be running in the background, even though it is not visible.  If you try to open it while it's running, an error message will appear with the option to click  Close Firefox . If that doesn't solve the problem, restart your computer or try the following options.  Fix Firefox Error Use the Windows Task Manager to close the existing Firefox process Right-click on an empty spot in the Windows task bar and select  Task Manager  (or press  Ctrl + Shift + Esc ). When the Windows Task Manager opens, se...