Firefox - Right Click Menu Flickers

I am using Firefox 17.0.1. My second monitor an AOC 1950W was replaced after developing a fault. Immediately I discovered a problem when using Firefox. Right clicking on a web-page resulted in the Right Click Menu flickering and disappearing making it difficult if not impossible to select a menu item. There was no problem on the main display. Using Chrome on this display there was no problem.

I checked settings were correct and that drivers were up-to-date to no avail. A Google search for "firefox right click menu flickers" produced the following suggestion:-

Try to disable hardware acceleration.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available" .

If disabling hardware acceleration works then check if there is an update available for your graphics display driver.

Untick box and restart Firefox, this solved the problem.