Why is a white bar displayed over the top of my address and menu bar, so i cant do anything with Firefox?

In Firefox, when I open a browser window, there is a white bar covering the menu and address bar, and I cant click anything, If i click the bar to try and move the window, I click through to windows behind the Mozilla window.
This has persisted through a re-install of Firefox. So I un-installed the browser, and reinstalled the latest version from the web site.

Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
*Use a compressed image type like PNG or JPG to save the screenshot
*Make sure that you do not exceed the maximum size of 1 MB
You can use one of these to set which toolbars to show.
*"3-bar" Firefox menu button > Customize > Show/Hide Toolbars
*View > Toolbars<br>Tap the Alt key or press F10 to show the Menu Bar
*Right-click empty toolbar area
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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