What is HTML5? (Infographic)
This article is in need of an editorial review. Extensions add new functionality to Mozilla applications such as Firefox, SeaMonkey and Thunderbird.
This is quick set of answers to the most common issues with extension development. They are currently written with mostly Firefox in mind, but most if not all should easily translate to SeaMonkey, Thunderbird or any of the other applications. For Thunderbird, you may also find the extension HowTo or FAQ pages helpful. If you're looking for a place to get started, try our tutorial, Building an Extension or MozillaZine's Getting started tutorial. Extension Frequently Asked Questions