Headers are not active when the FF browser starts or opened

[GoogleCodeExporter]

===Introduction===
When opening the firefox ,all the previous headers are already available on the 
header tool but its not active.Is there a way to open the browser with all the 
previous headers active as in modify headers.

===HTTP Protocol===

Put your comment inline into this example HTTP protocol :

#wget -d google.com

---request begin---
GET / HTTP/1.0
User-Agent: Wget/1.12 (linux-gnu)
Accept: */ *                            // example of comment
Host: www.google.it
Connection: Keep-Alive

---request end---
HTTP request sent, awaiting response...
---response begin---
HTTP/1.0 200 OK
Date: Sun, 03 Apr 2011 11:23:13 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Server: gws
X-XSS-Protection: 1; mode=block

---response end---

zd

Original issue reported on code.google.com by [email protected] on 28 Dec 2011 at 5:34

[GoogleCodeExporter]

Using 
FF 6.0 and header tool 0.3.6

Original comment by [email protected] on 28 Dec 2011 at 5:35