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

Attempted to download google Chrome, now get message saying site can't be trusted for google.com, this support page and others. Not all webpages are effected.

  • 3 replies
  • 3 have this problem
  • 6 views
  • Last reply by philipp

more options

Get message saying site can't be trusted, certificate chain problem. Does not happen for all websites. Google.com, facebook, Mozilla help page among others are effected. If I make an exception only shows text on left side for some sites, here and facebook. Attempted to use troubleshooter but could not find some of the things it suggested clicking on.

Get message saying site can't be trusted, certificate chain problem. Does not happen for all websites. Google.com, facebook, Mozilla help page among others are effected. If I make an exception only shows text on left side for some sites, here and facebook. Attempted to use troubleshooter but could not find some of the things it suggested clicking on.

Chosen solution

unfortunately the fiddler2 issuer in certificates might be a sign of unwanted software present on your pc that is intercepting secure network traffic. please go into the system control panel and uninstall programs like BrowserSafeguard, BrowserSafe, SafeGuard or other software that sounds suspicious and didn't get installed by you intentionally.
reference: https://support.mozilla.org/en-US/questions/982532#answer-520145

afterwards, run a full scan of your system with different security tools like the free version of malwarebytes & adwcleaner.

Troubleshoot Firefox issues caused by malware

Read this answer in context 👍 2

All Replies (3)

more options

hello, first please make sure that the date & time is set correctly on your system. if this doesn't solve the issue (or it is already set properly), a possible solution depends on different factors:

  • what is the error code shown under technical details on the error page?

in case the error code equals sec_error_unknown_issuer, please attempt to add an exception on the bottom of the error page & inspect the certificate (see the screenshot attached for instructions):

  • which issuer information does the certificate contain?

thank you!

"This Connection is Untrusted" error message appears - What to do

more options

I attempted to open my bank website. The homepage opened, when I attempted to access my account I received the unsecure message. The certificate is read as follows:

Issued To: CN: secure.whitneybank.com O: DO_NOT_TRUST OU: Created by http://www.fiddler2.com SN: 83:21:32:45:F4:46:2F:9F:40:CB:94:58:84:39:B0:0D Issued By:

CN: DO_NOT_TRUST_FiddlerRoot O: DO_NOT_TRUST OU: Created by http://www.fiddler2.com

Validity Issued on: 3/26/14 Expires on: 3/25/24

Fingerprints

SHA1 fingerprint CC:FE:45:E0:51:B4:DC:5D:31:D2:37:AE:02:0B:8D:9B:D8:AD:89:A2 MD5 fingerprint 61:9A:FB:0A:1F:E0:1F:8B:F4:96:C7:E2:58:DF:50:76

more options

Chosen Solution

unfortunately the fiddler2 issuer in certificates might be a sign of unwanted software present on your pc that is intercepting secure network traffic. please go into the system control panel and uninstall programs like BrowserSafeguard, BrowserSafe, SafeGuard or other software that sounds suspicious and didn't get installed by you intentionally.
reference: https://support.mozilla.org/en-US/questions/982532#answer-520145

afterwards, run a full scan of your system with different security tools like the free version of malwarebytes & adwcleaner.

Troubleshoot Firefox issues caused by malware