This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending t

  • 7 cavab
  • 1 has this problem
  • 8 views
  • Last reply by Paul

more options

Hi Can't use Google search what so ever in my android firefox ! getting this mesage

www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. Error code: SEC_ERROR_UNKNOWN_ISSUER

Please help me Thank you Eli Menda Israel elimenda@gmail.com

Hi Can't use Google search what so ever in my android firefox ! getting this mesage www.google.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. Error code: SEC_ERROR_UNKNOWN_ISSUER Please help me Thank you Eli Menda Israel elimenda@gmail.com

All Replies (7)

more options

Hi

I recomend that you make sure that your copy of Firefox for Android is up to date. This article will help:

https://support.mozilla.org/en-US/kb/update-latest-version-firefox-android

more options

Hi My copy of Firefox for Android is up to date! downloaded directly from google shop i have try to uninstall and reinstall, problem is still remain

more options

Do you have any add-ons installed?

more options

NO No add-ons installed on firefox

more options

Do you have any VPN or security software installed on you Android device?

more options

YES i use AdGuard for Android For several years now, I've never had a problem I had to remove FireFox and I use Chrome or Microsoft Edge with no problem at all nor Samsung internet browser

more options

Okay. It could be that AdGuard is causing this issue. You may wish to make sure this is up to date from the Google Play Store.

The other tip I have been pointed towards is setting Firefox for Android as the default browser to force Android to handle traffic to it correctly.