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I can't open Youtube.com. I get a message that says "Did not connect: Potential Security Issue"

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kirk2892
kirk2892
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Today all of the sudden, one of my computers running Firefox won't connect to Youtube at all. It says security issue with HSTS. It also says there there is nothing I can do to resolve it. Surely that can't be true. Youtube runs on every other computer in the office just fine.

Here is a screen capture of the message:

Today all of the sudden, one of my computers running Firefox won't connect to Youtube at all. It says security issue with HSTS. It also says there there is nothing I can do to resolve it. Surely that can't be true. Youtube runs on every other computer in the office just fine. Here is a screen capture of the message:
Attached screenshots

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