Programming

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So I just made my first Firefox add-on: 'Bookmarks menu'
More on that here.

A good place to start is Mozilla developers center and also "How to develop a Firefox extension"
What you will need is some html, javascript and XUL (XML User Interface Language) knowledge in order to make a Firefox add-on, time and a lot of Firefox restarts.
Well you may avoid the last since there is a helpful add-on called "Extension Developer".

Also recently Mozilla launched Jetpack an early beta of a project that will allow any web developer to build an extension easily as building a web site