I was reviewing some edits today and went to reject one (which one is irrelevant). After clicking on the reject button I selected the custom option and typed in my reason. I then clicked the reject button on the pop-up window. I was then presented with a red pop-up that stated something like "You appear to be using javascript to avoid clicking a button", or something similarly absurd. The rejection failed. The only JavaScript involved was that supplied by the site itself.