CHROME CRAZY: They say that a significant other is an extension of oneself. But a Chrome extension? Just a pain, if you don’t know what you need it for. But never fear, Chrome lovers--here’s a helpful guide on how and why to use extensions, along with 15 suggestions for the teacher Chrome user. (Our favorite? The Panic Button, which closes all open tabs in a Chrome window. Sorry; not applicable to relationships or breaking up.)