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Full screen to no screen .... click on Restore and I get a tiny box with Firefox on it

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"updated" Firefox and when I click on the "Restore" button the screen is reduced to a little box with Firefox on it. To go back to full size I have to click on the arrow next to Firefox, which opens a window, or box, then click on "Full Screen." What happened to the "normal screen," about a half sized screen ????

"updated" Firefox and when I click on the "Restore" button the screen is reduced to a little box with Firefox on it. To go back to full size I have to click on the arrow next to Firefox, which opens a window, or box, then click on "Full Screen." What happened to the "normal screen," about a half sized screen ????

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Resize the window by dragging the sides to make it larger (like from a corner). Be sure to close Firefox with the size that you want.