Opera Dragonfly alpha 2, the foundations of Opera’s upcoming Developer Tools. Debug JavaScript, inspect CSS and the DOM, and view any errors—Opera Dragonfly makes developing using Opera easier than ever, both on your computer and mobile phone. Check out our second alpha release for increased stability and newly added features. Opera Dragonfly is included in Opera 9.5 and above, and can be activated by clicking Tools → Advanced → Developer Tools in the menu bar.