Surely some mistake
I've been using dragonfly for ages in Opera 11, it is very good, perhaps this story simply refers to a new version?
Opera has released the first official beta version of Dragonfly, its open source debug tool for web developers. Similar to Mozilla's Firebug tool, Dragonfly debugs JavaScript, CSS, DOM, and HTML code, and it supports newer web technologies such as SVG and various HTML5 APIs. The tool includes a network inspector that lets you …
Glad to see the open-source Dragonfly getting more visibility. It allows remote debugging of mobile web sites from your computer also. Very cool!
FYI, you can wrap the <a href="opera:config#DeveloperTools|DeveloperToolsURL">"opera:config" Dragonfly link</a> within an HREF statement and it will be clickable when using Opera.
DragonFly is an already used name in the open source arena. I wonder if Opera knew/cared.
If you think I'm being pedantic, Mozilla Phoenix became Mozilla Firebird because Phoenix Technologies threatened to sue, and Mozilla Firebird became Mozilla Firefox because it conflicted with an obscure, rarely used, open source version of InterBase, a DB engine that has since descended to obscurity*.
* My apologies if you use Firebird/Interbase. You can commiserate with the other 17 users if you like.