--- a/firefox-devel.rst	Fri Nov 12 22:06:23 2010 +0200
+++ b/firefox-devel.rst	Fri Nov 12 22:27:30 2010 +0200
@@ -38,14 +38,32 @@
 
 This project may be of some help for the following:
 
-    * Help debugging web application.
-    * See which kind of web server the remote site is using.
-    * See the cookies sent by remote site.
+ * Help debugging web application.
+ * See which kind of web server the remote site is using.
+ * See the cookies sent by remote site.
+
+Alternatively you can use fiddler2 (only Windows as it written in .NET)
 
   http://livehttpheaders.mozdev.org/
                 home page
   https://addons.mozilla.org/en-US/firefox/addon/3829/
                 download page
+  http://www.fiddler2.com/fiddler2/
+                Web Debugging Proxy
+
+** Tamper Data.
+
+ * Use tamperdata to view and modify HTTP/HTTPS headers and post parameters.
+ * Trace and time http response/requests.
+ * Security test web applications by modifying POST parameters.
+
+Based on code and incompotable with "Live HTTP Headers" extensions.
+
+  http://tamperdata.mozdev.org/index.html
+                home page
+  https://addons.mozilla.org/en-US/firefox/addon/966/
+                download page
+  http://jimbojw.com/wiki/index.php?title=Tamper_Data
 
 * How build Firefox.