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Why is Firefox blocking access to Google and Amazon in the UK - other browsers don't ???

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The latest edition of Firefox blocks access to Google and Amazon in the UK, saying they are not secure.

These open normally in other browsers (see attached screenshot).

The latest edition of Firefox blocks access to Google and Amazon in the UK, saying they are not secure. These open normally in other browsers (see attached screenshot).
Attached screenshots

All Replies (2)

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One of couple things. Site is using a invalid certificate or can you not click advanced and put a exception in or disregard notice when know the site is actually valid ?

https://support.mozilla.org/en-US/kb/secure-website-certificate

Please let us know if this solved your issue or if need further assistance.

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Could you click that blue error code to open a panel with encoded certificate information. Then you can paste that into a reply. (The lines with ----- may turn into horizontal bars, but don't worry about that.)

To jump ahead, I'm going to use the form on this page to extract the issuer details to see whether it is some unexpected intermediary ("man in the middle"): https://certlogik.com/decoder/