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One of the many compelling reasons why Mozilla Firefox is by far the most used browser by web developers and designers is it’s variety of Add-Ons that come free, can be easily integrated and used right from the browser. http://www.webhostingsearch.com/articles/30-best-firefox-add-ons-for-designers-and-developers.php

Useful Firefox Add-Ons for Designers and Developers

Setting up an extension development environment - MDC

https://developer.mozilla.org/en-US/docs/Setting_up_extension_development_environment This article gives suggestions on how to set up your Mozilla application for extension development.
Extensions add new functionality to Mozilla applications such as Firefox, SeaMonkey and Thunderbird. They can add anything from a toolbar button to a completely new feature.

Extensions - MDC

https://developer.mozilla.org/en-US/docs/Extensions
https://developer.mozilla.org/en-US/docs/Extension_Packaging Extensions are a form of Installable Bundle which can be downloaded and installed by a user, or provided pre-packaged with an application or by an external program.

Extension Packaging - MDC