This halloween celebrate it with your Firefox web browser. Mozzilla just launched 40 persona designs just for this halloween. If you do not have Persona installed, follow the steps given here to install it.
Here are a few of of the halloween designs:

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Mozilla Labs has launced Persona, a new extension that adds dynamic theming to the browser. Persona allows the user to change the header and the footer of the browser. It is different from the Firefox theme because Persona does not change the buttons, menu etc. It is more of an extention to change the basic [...]