Suddenly, the drop downs don't show - what's wrong
For example, when I sign into Facebook, in the past my user name would drop down, now I can see a glimpse of it but it doesn't show long enough to click on it. Another example is that I cannot do online banking because the drop down menu to select the account does not show long enough to click on it. Same on the navigation bar, etc.
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration 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.org/kb/Safe+Mode
In Firefox 4 and later Safe mode disables extensions and disables hardware acceleration.
- http://kb.mozillazine.org/Safe_mode
- 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.