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I upgraded Firefox, and now there is a blue band on my screen above the window, and I'm not getting the full use of the screen in viewing web pages. How can I get the window to expand to fill the screen as it did before?

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There is a horizontal band or gap above the Firefox window at the top of the screen, where you can see the Windows desktop behind the Firefox window. On the left side of this band are the window tabs, and the menu bar, and another bar with the names of the open windows. I would like to have the Firefox window expand to fill the entire screen, like it did before the upgrade. Thanks.

There is a horizontal band or gap above the Firefox window at the top of the screen, where you can see the Windows desktop behind the Firefox window. On the left side of this band are the window tabs, and the menu bar, and another bar with the names of the open windows. I would like to have the Firefox window expand to fill the entire screen, like it did before the upgrade. Thanks.

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Do you mean running Firefox in full screen mode?

If you are in full screen mode then you can hover the mouse to the top to make the Navigation Toolbar and Tab bar appear.
You can click the Maximize button at the top right to leave full screen mode or right click empty space on a toolbar and use "Exit Full Screen Mode" or press F11.

You can also run Firefox in a maximized window to have easier access to the Menu bar and Navigation Toolbar.