Although it's more related to programming than web mapping, it's recommended to increase your abilities at using web debuggers.
Chrome DevTools by default offers the main functions to develop and debug with OpenLayers, but to be more efficient, it's really required to use extensions. Extensions are additions to Chrome browser or to the Developer Tools to add or augment default software functions. You can find most of them at http://www.google.com/intl/en/chrome/webstore/extensions.html.
We'll review some of them.