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Since last FF update Windows Taskbar is no longer visible at bottom of my screen

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Windows Taskbar is no longer visible at bottom of my screen. If I tap F11 twice, it will show briefly at the bottom, then disappears again.

Windows Taskbar is no longer visible at bottom of my screen. If I tap F11 twice, it will show briefly at the bottom, then disappears again.

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Is the Firefox window maximized?

Try to un-maximize the Firefox window and see if you can resize the Firefox window.

You can also try to rename/remove the xulstore.json file in the Firefox profile folder.

You can use this button to go to the current Firefox profile folder:

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PROBLEM STILL REMAIN I deleted xulstore.json file (in Firefox folder) but system recreated it. Do you know why? Thank you I'm on Firefox 54.0.1 (64 bit)