Developer Assistant 0.3.0.20140917.1-signed
A suite of tools for developers.
This add-on is not compatible with your version of Thunderbird because of the following:
Add extra features and styles to make Thunderbird your own.Close
Note that this add-on was called Extension Developer but has at least for the time being been changed to Developer Assistant to indicate that the Extension Building aspect of the application is not being actively maintained.