The fact is that I test scripts offline and I don’t have a debugger for opera. Opera dragonfly requires an internet connection. Firebug does not offer. I just want to dragonfly.
The situation, however, can be corrected. To do this, you need to install Dragonfly locally by downloading the archive from http://dragonfly.opera.com/app/zips/ and specify the location of the client-en.xml file in the Developer Tools settings.