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Firefox blocks some images on some websites, asks for a certificate

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The website works with explorer but not with firefox It blocks images of a website I like to go to

A message comes up and says" bomstatic.appspot.com 443 uses an invalid securtiy certificate .............................etc

View certificate

The website works with explorer but not with firefox It blocks images of a website I like to go to A message comes up and says" bomstatic.appspot.com 443 uses an invalid securtiy certificate .............................etc View certificate

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Have you checked the date / time setting on your PC?
Double-click the time display in the lower-right corner of the screen.

If that is not the problem.
Can you grab a screenshot of that certificate? And maybe provide the URL of the web page where you get that message?

https://support.mozilla.com/en-US/kb/Adding+screenshots