Extensions
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Add-on Developer Hub :: Add-ons for Firefox
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Learn the basics The easiest way to do that is to follow along with the Firefox Add-ons Developer Guide as it explains in detail the technologies used in extensions and walks through the creation of several basic extensions. Visit the Firefox Add-ons Developer Guide If you'd rather dive right in, there are several other tutorials in our Getting Started section of the How-to Library that jump straight into code.
Getting Started :: Add-ons for Firefox :: Developer Hub
Extend Firefox: Your Guide to Writing Firefox Extensions
Welcome Due to the recent surge in the number of Firefox users around the world, the interest in developing well-written extensions has become a goal of many individuals. Unfortunately, many of the tutorials currently online provide enough information to get users writing simple "Hello, World" extensions, and leaves you hanging on developing more interesting projects.An Overview of the AMO Review Process « Mozilla Add-ons Blog
Almost exactly a year ago, I wrote a long post detailing our add-on review process . It has been a few weeks since the launch of the new developer tools, and that warrants a new post explaining how the new review process works. I’ll try to keep it short this time. Did you create an add-on you want to host on AMO (addons.mozilla.org)?
Development Overview This tutorial has been created for individuals wanting to develop full-featured extensions for the Mozilla Firefox browser. The tutorial has been constructed as a step-by-step guide providing many examples, explanations, and external references to help the reader have a full understanding of extension development. Please use the menu on the left to navigate through this tutorial. Each section has been dedicated to a certain stage of the development process. It is recommended that you read through the tutorial in order, as some information builds upon previous sections.
Firefox Extension Development Tutorial :: Overview