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What to do about the recurring hang-up with message: A web page is slowing down your browser...?

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What to do about the recurring hang-up with message: A web page is slowing down your browser...? Especially on Youtube. This started happening with the recent Windows 10 and Firefox updates. How can this be fixed please?

What to do about the recurring hang-up with message: A web page is slowing down your browser...? Especially on Youtube. This started happening with the recent Windows 10 and Firefox updates. How can this be fixed please?

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