Firefox Personas is a great new feature that is now available with Firefox version 3.6. By default Firefox 3.6 allows users to preview Personas with mouseover. This is a cool feature, because you don’t have to install each and every Personas to find the matching one. But some users complaints that their Personas are not changing on mouseover. Are you facing the same problem on your browser? Here is a simple solution for you.
Go to Tools > Options > Security and add getpersonas.com to ‘Exceptions’ for "Warn me when sites try to install add-ons" option. Once getpersonas.com whitelisted, you will be able to see the difference. Now you can preview all available Firefox Personas with mouseover. Also, don’t forget to uncheck "Site Preferences" in "Settings for Clearing History". You can access it when you have checked "Clear History when Firefox closes" in ‘Privacy’ section of Firefox ‘Options’.