Using Add-on SDK to add toolbar buttons? Integrating XUL and Add-on SDK for Firefox Add-ons?

Question

I have already coded most of a Firefox add-on using the Add-on SDK API. I am now discovering that Add-on SDK might not be powerful enough for my purposes. I need two things:

Answer 1

The toolbarbuttonlib-jplib referenced above no longer exists, but try toolbarwidget-jplib. It works like a charm! Total life saver.