Jetpack (Firefox project)
Jetpack was a working group which wrote a software development kit for Firefox add-ons.[2][3] Add-ons developed with the SDK were written in HTML, CSS, and JavaScript using CommonJS conventions.The SDK's APIs were high-level, task-oriented, and designed to insulate developers from changes across Firefox versions.[4] Mozillians running the project made a tool called the Jetpack Prototype.APIs provided by the Jetpack Prototype were not compatible with the Add-on SDK.