2013765 - SEC_ERROR_UNKNOWN_ISSUER with DigiCert Global Root CA

Status: UNCONFIRMED

(Firefox :: Untriaged, defect)

Description

[Quintasan]

Attachment: Output of openssl s_client -showcerts -connect www.zec-service24.pl:443

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0

Steps to reproduce:

1. Navigate to https://www.zec-service24.pl/

Actual results:

Potential Security Risk Ahead warning shows up

Expected results:

The website should load normally, at least it does in Chrome and Opera

Comment 1

[Quintasan]

Attachment: Certificate in Firefox.jpg

Comment 2

[Quintasan]

Attachment: Certificate in Opera.png

Comment 3

[Quintasan]

This might be a server misconfiguration but I wonder why do Opera and Chrome work fine?

Comment 4

[Negritas Sergiu, Desktop QA]

Hello! I have tried to reproduce the issue with firefox 149.0a1(2026-02-02) on Ubuntu 22.04 and Windows 10, unfortunately I wasn't able to reproduce the issue.
Could you please answer the following questions in order to further investigate this issue

1. Does this issue happen with a new profile? Here is a link on how to create one: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
2. Could you please provide a video with the issue?