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Tabs detached from top menu and can't minimise

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So I have just logged on and the top bar menu has disappeared and the minimise button is greyed out. What has happened?

So I have just logged on and the top bar menu has disappeared and the minimise button is greyed out. What has happened?

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Make sure you do not run Firefox in Full Screen mode (press F11 or Fn + F11 to toggle; Mac: Command+Shift+F).