Firebreath is described as 'FireBreath is a framework that allows easy creation of powerful browser plugins. A plugin built on FireBreath works as an NPAPI plugin or as an ActiveX control (windows only) and support could be added for other plugin types built in C++ as well' and is an app in the development category. There are 1 alternatives to Firebreath for Mac, Windows, Linux and Web-based. The best Firebreath alternative is Kango, which is free.
Kango is an cross-browser extension framework, based on web-standards. Now everyone developer familiar with JavaScript can create extensions for all major browsers including even Internet Explorer.
