Right click occasionally causes menu to disappear on mouseover
Ubuntu 11.04 64-bit, 2.6.38.11 kernel, Firefox 6.0.2 Unity DE
On random occasions, right-clicking anywhere (either the web page or UI) and attempting to mouseover the right-click menu causes the menu to disappear. I can still activate functions by pressing the underlined letter key, provided I actively keep the mouse cursor away from the menu.
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
- https://support.mozilla.com/kb/Safe+Mode
In Firefox 4 and later Safe mode disables extensions and disables hardware acceleration.
- Edit > Preferences > 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.