One of the great and common conflicts with what we encounter web site developers every time we launched one more, is with the site compatibility with web browsers, that is, many times the web site that just looks perfect launch in Firefox, but if you open it with Opera things change and you no longer see the things we want where we want.
Be testing our website in different web browsers and even different operating systems would be the most common and most "fast" to us might happen, well at least the first thing that comes to mind, but it is not more optimal in terms of time invested.
To save time, there BrowserShots that helps us know how you see our website in different web browsers and different operating systems on the market.