Kango is described as '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' and is an app in the development category. There are 1 alternatives to Kango for Mac, Windows, Linux and Web-based. The best Kango alternative is Firebreath, which is both free and Open Source.
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.
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