What is your problem with Firefox?

Please give as much detail as you can.

this is the problem !

when i try to open facebook

You may have enabled SSL scanning in your security software such as Avast, Bitdefender, ESET or Kaspersky. Try to disable this option. You may also see this error message on major sites like Google, Facebook, YouTube and others on Windows in user accounts protected by Microsoft family settings. If that doesn't work, it seems a little more troubleshooting is needed to help resolve this thread. Follow the steps below to collect the Certificate Error troubleshooting information. #From the error page pictured below look for the error message.<br>[[Image:Your connection is not secure page|width=500]] #Click on the "Advanced" button and it will show the error link.<br>[[Image:Your Connection is not Secure Advanced page|width=500]] #Click on the error link and you will be taken to a page that you can copy the error text to the clipboard. The image below has blocked out the certificate for this example.<br>[[Image:Certificate error chain|width=500]] '''If this is a self-signed certificate please remove the information below "--BEGIN CERTIFICATE"''' <!--Note to add the next steps for troubleshooting if they need to speak to the security team about the cert list in the privacy lists if this is not helpfuL [https://blog.mozilla.org/security/2016/01/06/man-in-the-middle-interfering-with-increased-security/] Phasing out of SHA-1 or victims of man in the middle attacks-->