What is the URL of your online bank? What do you see in the front of the URL? Green paddlock?

Hi FrustratedUser99, Firefox works normally with most secure sites, but has discontinued support for some older ciphers and protocols that are considered too weak to provide real protection.

What error message to you get when you try to access your bank? often the page will have an "Advanced" button that reveals technical details about the problem. Could you copy/paste that information into a reply here? That will help point toward the solution. Thanks.

If you can't inspect the certificate via Advanced (I Understand the Risks) then try this:

Open the "Add Security Exception" window by pasting this chrome URL in the Firefox location/address bar and check the certificate:

• chrome://pippki/content/exceptionDialog.xul

In the location field of this window type or paste the URL of the website with the https:// protocol prefix (https://xxx.xxx).

• retrieve the certificate via the "Get certificate" button
• click the "View..." button to inspect the certificate in the Certificate Viewer

You can inspect details like the issuer and the certificate chain in the Details tab of the Certificate Viewer. Check who is the issuer of the certificate. If necessary then please attach a screenshot that shows the Certificate Viewer with the issuer.

See also:

• SSleuth: https://addons.mozilla.org/firefox/addon/ssleuth