This is about the only type of addon that genuinely needs full access to everything - the type that replaces your browsing interface. It needs to be able to int

This is about the only type of addon that genuinely needs full access to everything - the type that replaces your browsing interface. It needs to be able to interact in all the possible ways with every single element on the page. There's no way around it having scary powers, because using them is its base purpose.