engadget: “Given the frequency of hacks and data leaks these days, chances are goo at least one of your passwords has been released to the wild. A new Chrome extension released by Google today makes it a little easier to stay on top of that: Once installed, Password Checkup will simply sit in your Chrome browser and alert you if you enter a username / password combination that Google “knows to be unsafe.” The company says it has a database of 4 billion credentials that have been compromised in various data breaches that it can check against…”