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when I move the mouse to the Personas picture, am I suppose to get a preview? I'm having two desktop here, one is working alright, but the other is not. Please help.

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I have both Firefox updated but one of the desktop isn't showing preview for the Firefox Personas, while the other working alright.

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Previewing a persona only works on sites that are whitelisted via an allow exception.

Tools > Options > Security : "Warn me when sites try to install add-ons": Exceptions

Make sure that you do not use Delete browsing, search and download history on Firefox to clear the 'Site Preferences'.

See http://kb.mozillazine.org/Themes#Lightweight_theme