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Why am I being asked to update firefox, when I am using 50.1.0 01-16-17

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The request appears below my address bar, in a black background format and disappears when I refresh the screen only to appear later. I suspect this may be a hacker...

The request appears below my address bar, in a black background format and disappears when I refresh the screen only to appear later. I suspect this may be a hacker...

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Please provide a screenshot of that the next time it appears.