Opera Dragonfly

Opera Dragonfly is a web development tool that was integrated into the Opera web browser from Opera versions 9.5 through 12.18, similar to Firebug and development tools built into Mozilla Firefox and Google Chrome.

It supports debugging JavaScript, viewing the DOM, monitoring network traffic, previewing resources, editing colors, etc. It also supports remote debugging, which allows using the features of Dragonfly to be used when debugging a mobile phone, TV, or another desktop computer.

Opera Dragonfly must be downloaded on first usage, and functions offline thereafter. Opera Dragonfly automatically updates to the latest version available, when connected to the Internet.

Opera Dragonfly is compatible with Presto 2.1 and later, specifically Opera Mobile 9.5 and above, and Opera Desktop 9.5 and above.

The Scope transport protocol (STP) is used for communication between the Opera browser and Opera Dragonfly.