Google rejected it as "spam" for the Chrome extension store, but it's available for Firefox. It was a quick hack yesterday to make the URLs visible. Pull requests are welcome. It misses a few cases, and the URL should probably be green rather than highlighted.
https://addons.mozilla.org/en-US/firefox/addon/search-engine...
https://github.com/codeselfstudy/search_engine_show_me_urls