Need suggestions for automated browser cookie enable/disable/remove app

So, my dad is really paranoid about the whole browser cookies deal. Everytime he wants to go to a site that requires cookies, he goes to Preferences and enables cookies only for websites you visit, does his business on the site, then disables and deletes all cookies when he's done. So I figured for Christmast I would make or find him a widget/app that automatically does the above mentioned actions with a single click or keystroke.

My question is: What would be the best way to go about setting this up? Does such an application or widget already exist? Anything is much appreciated.

Thanks,

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