Mysterious empty bar at the top of my screen

I have a mysterious empty bar at the top of my screen that it happened when I updated to the latest version and I can't seem to go in my web pages fit now I have to scroll down a little more than usual

Click help | Restart with disabled modules and in the menu that appears, check "reset the bars of tools and controls. Then click on the button called "make changes and restart".

Tags: Firefox

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