Rated 5 out of 5 stars

How do I make it work in Firefox 4? There's no status bar.

This review is for a previous version of the add-on (1.3.4.2). 

Add-on Bar

Just enable Add-on Bar: View -> Toolbars -> Add-on Bar
The Header Spy panels will show on it. Also the NoScript and AdBlock Plus icons will be shows on this bar too.