A Google search for “men’s dress shirts” yields a list of ads and results from the most expected brands. But if you install a new Chrome extension called DoneGood, you’ll also get a lesser-known suggestion: Tuckerman, a startup that makes organic cotton shirts in a union factory in Massachusetts. With any consumer search, if a more sustainable or ethically made option is available, the extension will automatically recommend it. “Our overarching goal is always to…