Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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
Solved Archived

I keep getting SEC_ERROR_BAD_SIGNATURE in Firefox when same url is OK in chrome

philipp replied
daveslatter

Firefox is my default browser, and Google.co.uk is my home page - every time I startup Firefox the url redirects to https://www.google.co.uk/?gws_rd=ssl and I get the SEC_ERROR_BAD_SIGNATURE problem. The message seems to happen on other https:// urls within Firefox but the same pages are easily accessed when using Chrome browser. I am using Bullguard internet security. Thanks in advance. Dave S

Firefox is my default browser, and Google.co.uk is my home page - every time I startup Firefox the url redirects to https://www.google.co.uk/?gws_rd=ssl and I get the SEC_ERROR_BAD_SIGNATURE problem. The message seems to happen on other https:// urls within Firefox but the same pages are easily accessed when using Chrome browser. I am using Bullguard internet security. Thanks in advance. Dave S

All Replies (1)

Chosen Solution

hi daveslatter, can you see if the steps from this link make a difference?: https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER#w_bullguard