I download the source code of this blog(http://
www.softwareishard.com/blog/firebug-tutorial/extending-firebug-toolbar-part-ii/).
It do create a panel named "hello world" and a button in it. But when
I click it, nothing happens. What's wrong with it? how could I debug
firebug extension?
My firefox version is 7.0.1. because the install.rdf's version is
small, so I change this:
<em:maxVersion>10.0.*</em:maxVersion>