Why is firefox suddenly denied access to reliable sites, calling it "unreliable"?

My husband used a reliable medical site for years... suddenly the message came "untrusted site". We contacted the site - they we connected to their tech support - he tried everything with us by telephone (cleaning cookies, download the latest version of firefox), but the only way to solve it was to give firefox the go-ahead to ignore their warning. Then, we got the site. Today, the same message popped up on another site that he uses regularly. Any ideas why this happens suddenly on sites reliable, used successfully for years?

STOP THE PRESSES! I finally found the windows update - it turned out that the date and time on my computer were not sync (we had a power failure, a few days ago that must have triggered it!). Thank you very much!

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Tags: Firefox

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