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Eset security says firefox using untrusted certificate and blocks?

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My Eset security account was recently updated and now I frequently get a message that firefox is blocked due to untrusted certificate. Is this a firefox problem or something else? How do I fix?

My Eset security account was recently updated and now I frequently get a message that firefox is blocked due to untrusted certificate. Is this a firefox problem or something else? How do I fix?

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Could you post the full text of the message, word for word, or a screen shot of it? We've had many threads on ESET, but this message doesn't sound familiar.

This article has tips on screenshots: How do I create a screenshot of my problem? Please cut out or blur any sensitive information in the image before attaching it to your reply.