Mozilla Firefox Help

On websites which are supposed to be secure (the URL begins with "http s ://"), Firefox must verify that the certificate presented by the website is valid. If the certificate cannot be validated, Firefox will stop the connection to the website and show a "Warning: Potential Security Risk Ahead" error page instead. Clicking the   button, you can view the specific error Firefox encountered. This article explains why you might see the error codes SEC_ERROR_UNKNOWN_ISSUER, MOZILLA_PKIX_ERROR_MITM_DETECTED or ERROR_SELF_SIGNED_CERT on an error page and how to troubleshoot it.  Fix Firefox Error What does this error code mean? During a secure connection, a website must provide a certificate issued by a trusted certificate authority to ensure that the user is connected to the intended target and the connection is encrypted. If you click the button on a "Warning: Potential Security Risk Ahead" error page and you see the error code SEC_ERROR_UNKNOWN_ISSUER or MOZIL...

  Like every program, Firefox sometimes freezes and crashes, and some websites might not load correctly. These occasional glitches don't require your attention, but if the program repeatedly runs into a major problem, it might indicate trouble with your profile settings or an extension, or the program itself might need reinstalling. Full reinstallation is a last resort, however, and most solutions retain your browser customizations and bookmarks. Initial Troubleshooting Steps Before taking any elaborate measures, try rebooting your computer. Though a stereotypical answer to almost any computer problem, a reboot can actually fix all sorts of unusual problems by clearing everything out of the system's memory. If you're having trouble with a particular site, also try erasing your cache: Press "Ctrl-Shift-Del," set the time range to "Everything" and make sure "Cache" is checked in the  Details  section. If these basic solutions don't help, the ...

  If you still face the Firefox error message SEC_ERROR_EXPIRED_CERTIFICATE after completing the above steps, go through the steps below and check whether the website you’re visiting has an expired SSL/TLS Certificate. In the address bar, click on the padlock. If the SS/TLS Certificate is expired, you’ll get a ‘Connection not secure’ message.   Fix Firefox Error Click on the  Connection not secure option  and click on ‘ More Information .’ Once the Page info pop up opens, check for the expiry date. If the certificate is expired, as a website visitor, you will not be able to do anything unless the website owner renews it. If you’re the owner of the website, then it’s recommended to renew the SSL/TLS Certificate from a trusted Certificate Authority without delaying it further.                   Call   1-856-514-8666  for help and support of Fix Firefox Error.

  A   crash   is what happens when Firefox closes or quits unexpectedly and the   Mozilla Crash Reporter   appears. If Firefox keeps crashing when you open it, this article will show you how to get it working again. Other problems with crashing: If Firefox starts without crashing but then crashes later on, see the Firefox crashes - Troubleshoot, prevent and get help fixing crashes article for solutions. If Firefox won't start at all, but the Mozilla Crash Reporter appears, see the Firefox won't start - find solutions article for other possible fixes. See if you can start in Firefox Safe Mode As a first step you should see if Firefox starts in Firefox Safe Mode. This special startup mode temporarily turns off hardware acceleration among other settings and disables installed extensions that may prevent Firefox from starting. If you can start in Firefox Safe Mode, see the article Troubleshoot extensions, themes and hardware acceleratio...