At least in some browsers (such as those built by search engine/advertising companies), I would worry about pasting anything into the URL bar because it will be

At least in some browsers (such as those built by search engine/advertising companies), I would worry about pasting anything into the URL bar because it will be immediately sent to third-parties to assess what search terms to recommend in the suggestion box. It's probably safe to do so in some browsers. But I would recommend using a network sniffer to see what happens when you paste into the URL bar.