One day, for no apparent reason, what I'm assuming was a Google Chrome extension was installed on my computer without telling me. It was this thing where when you highlight a word a little box appears. Clicking on icons in this box allowed you to search the word on Google, Twitter, Youtube, Dictionary.com and some other things. But for whatever reason this extension is no longer on my computer and I want it back. But I don't know what it's called. Any help?