Firefox extension icon on the navigation bar using the Add-on builder

Question

How do I add an icon to Firefox that opens up a panel on click on the navigation bar. An example is the Firebug extension. The only thing that will be different, is that I w

Answer 1

You might want to use or take a look at this toolbarbutton library:

https://builder.addons.mozilla.org/library/1006210/latest/