Does anyone know of a way to automatically clear the clipboard when closing Firefox? I recall an older version of FF did this once all the windows in Private Browsing were closed but that's apparently been removed. Ideally, I'd like an option to clear my clipboard once I close FF regardless of whether I'm in Private mode or just regular browsing but even just clearing it for Private Browsing would be really handy. I'm willing to use addons or tweak the settings in about:config if needed. Thanks!