I want to deny access to my clipboard on specific website.In fact, i want to take full control of my browser clipboard event, such as history,action and permission. I have tried to use "dom.event.clipboardevents.enabled" and "*asyncClipboard*" configuration options, but not work well, some harmful website could still read/write my clipboard.The extension "Don't xxxx With Paste" do not work well too. There are nothing about clipboard on firefox settings.