Jetpack (Firefox project)

Jetpack was a working group which wrote a software development kit for Firefox add-ons. They produced the Add-on SDK, a set of APIs, a runtime, and a command-line tool for creating and running add-ons, and the Add-on Builder, a Web-based integrated development environment which used the SDK. Add-ons developed with the SDK were written in HTML, CSS, and JavaScript using CommonJS conventions.

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