I got an E-mail the other day from a guy who wanted to know if I knew of a starting spot for people to visit if they were interested in making extensions for Firefox. I had to do some hunting around – but then I found this link via Mozilla’s own Web site:
Extensions are small add-ons that add new functionality to Mozilla applications such as Firefox and Thunderbird. They can add anything from a toolbar button to a completely new feature. They allow the application to be customized to fit the personal needs of each user if they need additional features, while keeping the applications small to download.
There is a lot of good information here to be had. Check it out for yourself, and if you have any more resources please leave a comment and let us all know about them.