created for individuals wanting to develop full-featured extensions for the Mozilla Firefox browser. The tutorial has been constructed as a step-by-step guide providing many examples, explanations, and external references and more...
a great list of keyboard shortcuts for the upcoming IE7. What makes it even greater, however, is that almost all of the shortcuts work identically in Firefox.
Firefox Extension for web developers/designers as well as casual users "As you glide the mouse over the page, you will see a red rectangle framing each element under the cursor."