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How to stop white screen at the top

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Mozilla Firefox has a white bar at the top above the Colorful Tabs. How do I go back to screen that DOES NOT have this white bar across the top?

Mozilla Firefox has a white bar at the top above the Colorful Tabs. How do I go back to screen that DOES NOT have this white bar across the top?

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In order to better assist you with your issue please provide us with a screenshot. If you need help to create a screenshot, please see How do I create a screenshot of my problem?

Once you've done this, attach the saved screenshot file to your forum post by clicking the Browse... button below the Post your reply box. This will help us to visualize the problem.

Thank you!