How do I stop the menu from disappearing and reappearing as I move down the list, when the window is smaller than drop-down list?
If the window is smaller than the menu drop-down list and I click on a menu name the list appears and immediately disappears with a faint outline visible. As I move down the list the items appear briefly and then disappear again. Clicking on the location of an item on the list does NOT activate that item.
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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.
- 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.