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Fiewfox won't let me connect si sites I have used for years such as YouTube, etc

I want to delete Firefox and reinstall to see if this solves the problem. If not, I want to permanently delete this browser from my computer.

I want to delete Firefox and reinstall to see if this solves the problem. If not, I want to permanently delete this browser from my computer.

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What error message to you get when trying to connect to YouTube or other sites? If Firefox presents a secure connection error, check for an "Advanced" button for more information. Can you copy/paste the error text in a reply here on the forum?