Perfect perfect perfect Rated 5 out of 5 stars
First of all, I love it it's better than Header Monitor however just a note for anybody thought that Header Spy provide only the basic information about the header No No ,it's not true just go to Header Spy "options" and in the "config" tab there is "add" button to add any Level of information in details like :
* Cache control
* Content Encoding
.... And Much Much more .
and also it's not dependent on Live HTTP Headers , also take a look at The "Headers" tab in the "Page Info" window and you will know why this extension is much better than Header Monitor.
and I wonder why this extension is rated less than Header Monitor so I give this extension 10/10 good work and keep going ;)