Black bar covering upper right window controls

Ever since I "refreshed" Firefox 36, a small black bar has appeared in the extreme upper right corner of the Firefox screen that exactly
covers the Minimize/Resize/Exit buttons. Although the controls work properly when I click in the left/center/right area of the black bar, why is the bar there, in that exact spot, in the first place? And how do I get rid of it?

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
You can try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
You need to close and restart Firefox after toggling this setting.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration
You can try a different Windows theme to see if that helps.

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