diff --git a/popup/config.html b/popup/config.html
index 662d352a09a2119f2d7b58f2657a602205d435d8..f75ce088c482a91dc3ffa6bcfc031ed0bf20d9ab 100644
--- a/popup/config.html
+++ b/popup/config.html
@@ -4,7 +4,7 @@
 	<head>
   <title>Simple Modify Headers</title>
   <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="stylesheet" href="bootstrap.min.css"> 
 
 
@@ -35,91 +35,105 @@
 
 <body>
 
-<div class="container">
 
 
+<div class="container">
+
+	<!-- MAIN SCREEN  --> 
+	<div id="main_screen">
+		<div class="row">
+    			<div class="col-sm-6">  <h2 class="title"> SIMPLE MODIFY HEADERS  </h2> </div>
+    			<div class="col-sm-6"> <img id="start_img" src="img/start.png" align="right" valign="top"> </img> </div>
+		</div>
+ 		<br/>
+
+	
+ 		<div class="row">
+   			<div class="col-sm-8">  
+     				<b> Url Patterns* : </b> <input size="50" id="targetPage"  class="form_control input_url" type="text" value="">
+   			</div>
+   			<div class="col-sm-4" align="right"> 
+				<a href="#" id="export_button" class="btn btn-primary btn-sm" >
+          				<span class="glyphicon glyphicon-export"></span> Export
+        			</a> 
+				<a href="#" id="import_button" class="btn btn-primary btn-sm" >
+          				<span class="glyphicon glyphicon-import"></span> Import
+        			</a>
+				<a href="#" id="parameters_button" class="btn btn-primary btn-sm">
+          				<span class="glyphicon glyphicon-cog"></span> 
+        			</a>  
+   			</div>
+		</div> 
 
-<div class="row">
-  <div class="col-sm-6">  <h2 class="title"> SIMPLE MODIFY HEADERS  </h2> </div>
-  <div class="col-sm-6"> <img id="start_img" src="img/start.png" align="right" valign="top"> </img> </div>
-</div>
-<br/>
- <div class="row">
-  <div class="col-sm-8">  
-  <b> Url Patterns* : </b> <input size="75" id="targetPage"  class="form_control input_url" type="text" value="">
-  </div>
-  <div class="col-sm-4" align="right"> 
-	<a href="#" id="export_button" class="btn btn-primary btn-sm" style="width:100px">
-          <span class="glyphicon glyphicon-export"></span> Export
-        </a> 
-	<a href="#" id="import_button" class="btn btn-primary btn-sm" style="width:100px">
-          <span class="glyphicon glyphicon-import"></span> Import
-        </a> 
- </div>
-</div> 
-<br/>
-<center>
-
-  <table class="table table-condensed " > 
-	<thead>
-	<tr>
-		<th> Action </th>		
-		<th> Header Field Name </th>
-		<th> Header Field Value </th>
-		<th> Comment </th>
-		<th> Apply on </th>
-		<th> Status </th>
-		<th> </th>
-		<th> </th>
-		<th> </th>
-	</tr>
-	</thead>
-	<tbody id="config_tab">
-	</tbody>
-  </table>
-
-</center>
-
-<center>
-
-
-	<a href="#" id="add_button" class="btn btn-primary btn-sm" style="width:100px">
-          <span class="glyphicon glyphicon-plus"></span> New line
-        </a> 
-	<a href="#" id="save_button" class="btn btn-primary btn-sm" style="width:100px">
-          <span class="glyphicon glyphicon-save"></span> Save
-        </a> 
-
-
-
-</center>
-
-
-
-<br>
-<div class="row">
-	<div class="col-sm-10">
-	<input type="checkbox" id="debug_mode"> Debug mode </input>
-	<br/><br/>	
-		<i style="font-size:10pt"> * Informations on url pattern can be found <a href="https://developer.chrome.com/extensions/match_patterns" target="_blank"> here.</a> <br> An empty string on the field will select all urls. It's possible to select mutliple url patterns using semicolon(;) separator </i>
-
-		
-	</div>
-	<div class="col-sm-2" align="right" >
 		<br/>
+		<center>
+  			<table id="table_config" class="table table-condensed " > 
+				<thead>
+					<tr id="config_table_head">
+						<th> Action </th>		
+						<th> Header Field Name </th>
+						<th> Header Field Value </th>
+						<th> Comment </th>
+						<th> Apply on </th>
+						<th> Status </th>
+						<th> </th>
+						<th> </th>
+						<th> </th>
+					</tr>
+				</thead>
+				<tbody id="config_tab">
+				</tbody>
+  			</table>
+		</center>
+		<center>
+			<a href="#" id="add_button" class="btn btn-primary btn-sm" style="width:100px">
+        			<span class="glyphicon glyphicon-plus"></span> New line
+        		</a> 
+			<a href="#" id="save_button" class="btn btn-primary btn-sm" style="width:100px">
+          			<span class="glyphicon glyphicon-save"></span> Save
+        		</a> 
+		</center>
+	
 		<br/>
-		<a href="https://github.com/didierfred/SimpleModifyHeaders/tree/V1.5" target="_blank"> <span class="glyphicon glyphicon-question-sign"></span> About </a>
+		<div class="row">
+			<div class="col-sm-10">
+				
+				<i style="font-size:10pt"> * Informations on url pattern can be found <a href="https://developer.chrome.com/extensions/match_patterns" target="_blank"> here.</a> <br> An empty string on the field will select all urls. It's possible to select mutliple url patterns using semicolon(;) separator </i>
+
+
+			</div>
+			<div class="col-sm-2" align="right" >
+
+				<a href="https://github.com/didierfred/SimpleModifyHeaders/tree/V1.5" target="_blank"> <span class="glyphicon glyphicon-question-sign"></span> About </a>
+			</div>
+		</div>
 	</div>
-</div>
 
+	<!-- PARAMETERS SCREEN -->
+	<div id="parameters_screen" hidden>
+		<h2 class="title"> SIMPLE MODIFY HEADERS  </h2> 
+	
+		<b> Parameters : </b>
+		<br/>
+		<br/>
+		<input type="checkbox" id="debug_mode"> Debug mode </input>
+		<br/>
+		<input type="checkbox" id="show_comments"> Show comments </input>
+		<br/>
+		<br/>
+		<a href="#" id="exit_parameters_screen_button" class="btn btn-primary btn-sm" style="width:100px">
+        		<span class="glyphicon glyphicon-step-backward"></span> Back
+        	</a> 
 
-<iframe id="download" width="0" height="0" frameBorder="0"> 
-</iframe>
+	</div>
 
-<br>
 
- <script type="text/javascript" src="config.js"> </script>
 
+	<iframe id="download" width="0" height="0" frameBorder="0"> 
+	</iframe>
+	<br/>
+	<script type="text/javascript" src="config.js"> </script>
+</div>
 </body>
 
 </html>
diff --git a/popup/config.js b/popup/config.js
index e8c94aa44d3f7e897fa445f79eb2be36819a268a..7a595987a5289df10319884c0ebcb3ee92501892 100644
--- a/popup/config.js
+++ b/popup/config.js
@@ -5,44 +5,86 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. 
  *
  * @author didierfred@gmail.com
- * @version 0.4
+ * @version 0.5
  */
 
 
 var line_number = 1;
 var started = "off";
+var show_comments = true;
+var header_name_field_size= 20;
+var header_value_field_size= 28;
+var comments_field_size= 28;
 
 window.onload = function() {
 	// load configuration from local storage
 	var config = JSON.parse(localStorage.getItem("config"));
 
+
+	if (config.debug_mode) document.getElementById("debug_mode").checked = true;
+
+	if (typeof config.show_comments == 'undefined') document.getElementById("show_comments").checked = true;	
+	else if (config.show_comments) document.getElementById("show_comments").checked = true;	
+	else show_comments=false;
 		
 	for (var to_add of config.headers) appendLine(to_add.action,to_add.header_name,to_add.header_value,to_add.comment,to_add.apply_on,to_add.status);
 	document.getElementById('save_button').addEventListener('click',function (e) {save_data();});
 	document.getElementById('export_button').addEventListener('click',function (e) {export_data();});
 	document.getElementById('import_button').addEventListener('click',function (e) {import_data(e);});
+	document.getElementById('parameters_button').addEventListener('click',function (e) {showParametersScreen();});
 	document.getElementById('add_button').addEventListener('click',function (e) {appendLine("add","-","-","","req","on");});
 	document.getElementById('start_img').addEventListener('click',function (e) {start_modify();});
 	document.getElementById('targetPage').value=config.target_page;
 	document.getElementById('targetPage').addEventListener('keyup',function (e) {checkTargetPageField();});
+	document.getElementById('exit_parameters_screen_button').addEventListener('click',function (e) {hideParametersScreen();});
 	
 	started = localStorage.getItem("started");
 	if (started=="on") document.getElementById("start_img").src = "img/stop.png";	
 	
-	if (config.debug_mode) document.getElementById("debug_mode").checked = true;	
+
+	document.getElementById('show_comments').addEventListener('click',function (e) {showCommentsClick();});
+	reshapeTable();	
 } ;
 
+
+/** PARAMETERS SCREEN MANAGEMENT **/
+
+function showParametersScreen()
+{
+document.getElementById('main_screen').hidden=true;
+document.getElementById('parameters_screen').hidden=false;
+}
+
+
+function hideParametersScreen()
+{
+document.getElementById('main_screen').hidden=false;
+document.getElementById('parameters_screen').hidden=true;
+}
+
+function showCommentsClick()
+{
+if (document.getElementById('show_comments').checked) show_comments = true;
+else show_comments = false;
+reshapeTable();
+}
+
+/** END PARAMETERS SCREEN MANAGEMENT **/
+
+
+
 /**
 * Add a new configuration line on the UI 
 **/
 function appendLine(action,header_name,header_value,comment,apply_on,status) {
 
 var html = "<td><select class=\"form_control select_field\" id=\"select_action" + line_number + "\" disable=false><option value=\"add\">Add</option><option value=\"modify\">Modify</option><option value=\"delete\">Delete</option></select></td>";
-html = html + "<td><input class=\"form_control input_field\"  id=\"header_name"+ line_number + "\"></input></td>";
-html = html + "<td><input class=\"form_control input_field\"  size=\"28\" id=\"header_value"+ line_number + "\"></input></td>";
-html = html + "<td><input class=\"form_control input_field\"  size=\"28\" id=\"comment"+ line_number + "\"></input></td>";
+html = html + "<td><input class=\"form_control input_field\"  size=\"" + header_name_field_size + "\" id=\"header_name"+ line_number + "\"></input></td>";
+html = html + "<td><input class=\"form_control input_field\"  size=\"" + header_value_field_size + "\" id=\"header_value"+ line_number + "\"></input></td>";
+html = html + "<td";
+if (!show_comments) html=html+" hidden";
+html = html + "><input class=\"form_control input_field\"  size=\""+ comments_field_size+ "\" id=\"comment"+ line_number + "\"></input></td>";
 html = html + "<td><select class=\"form_control select_field\" id=\"apply_on" + line_number + "\"><option value=\"req\"> Request </option><option value=\"res\">Response</option></select></td>";
-//html = html + "<td><select class=\"form_control select_field\" id=\"select_status" + line_number + "\"><option value=\"on\"> ON </option><option value=\"off\">OFF</option></select></td>";
 html = html +  "<td><a href=\"#\" title=\"Activate/Descativate rule\" id=\"activate_button" + line_number + "\" class=\"btn btn-primary btn-sm\">ON  <span class=\"glyphicon glyphicon-ok\"></span></a></td>";
 html = html +  "<td><a href=\"#\" title=\"Move line up\" id=\"up_button" + line_number + "\" class=\"btn btn-default btn-sm\"> <span class=\"glyphicon glyphicon-arrow-up\"></span></a></td>"; 
 html = html +  "<td><a href=\"#\" title=\"Move line down\" id=\"down_button" + line_number + "\" class=\"btn btn-default btn-sm\"> <span class=\"glyphicon glyphicon-arrow-down\"></span></a></td>"; 
@@ -53,13 +95,13 @@ newTR.id="line" + line_number;
 newTR.innerHTML = html;
 document.getElementById("config_tab").appendChild(newTR);
 document.getElementById("select_action"+line_number).value = action;
-//document.getElementById("select_status"+line_number).value = status;
 document.getElementById("apply_on"+line_number).value = apply_on;
 document.getElementById("header_name"+line_number).value = header_name;
 document.getElementById("header_value"+line_number).value = header_value;
 document.getElementById("comment"+line_number).value = comment;
+
 var line_number_to_modify = line_number;
-document.getElementById('activate_button'+line_number).addEventListener('click',function (e) {switch_activate_button(line_number_to_modify)});
+document.getElementById('activate_button'+line_number).addEventListener('click',function (e) {switchActivateButton(line_number_to_modify)});
 setButtonStatus(document.getElementById('activate_button'+line_number),status);
 document.getElementById('delete_button'+line_number).addEventListener('click',function (e) {delete_line(line_number_to_modify)});
 document.getElementById('up_button'+line_number).addEventListener('click',function (e) {invert_line(line_number_to_modify,line_number_to_modify-1)});
@@ -67,6 +109,9 @@ document.getElementById('down_button'+line_number).addEventListener('click',func
 line_number++;
 }
 
+
+/** ACTIVATE BUTTON MANAGEMENT **/ 
+
 function setButtonStatus(button,status)
 {
 if (status=="on")
@@ -88,7 +133,7 @@ return "off";
 }
 
 
-function switch_activate_button(button_number)
+function switchActivateButton(button_number)
 {
 var activate_button = document.getElementById("activate_button"+button_number);
 
@@ -100,6 +145,39 @@ else setButtonStatus(activate_button,"on");
 
 }
 
+/** END ACTIVATE BUTTON MANAGEMENT **/ 
+
+
+/** Resahpe the table  **/
+
+function reshapeTable()
+{
+var th_elements = document.querySelectorAll("#config_table_head th");
+var tr_elements = document.querySelectorAll("#config_tab tr");
+if (show_comments) 
+	{
+	header_name_field_size= 20;
+	header_value_field_size= 28;
+	}
+else 
+	{
+	header_name_field_size= 34;
+	header_value_field_size= 42;
+	}
+
+for (i=0;i<tr_elements.length;i++)
+	{
+	tr_elements[i].childNodes[3].hidden = (!show_comments);
+	tr_elements[i].childNodes[2].childNodes[0].size=header_value_field_size;
+	tr_elements[i].childNodes[1].childNodes[0].size=header_name_field_size;
+	}
+
+th_elements[3].hidden = (!show_comments);
+
+}
+
+
+
 /**
 * Create a JSON String representing the configuration data 
 *
@@ -109,6 +187,7 @@ function create_configuration_data()
 	var tr_elements = document.querySelectorAll("#config_tab tr");
 	var headers = [];
 	var debug_mode=false;
+	var show_comments=false;
 	for (i=0;i<tr_elements.length;i++)
 		{
 	
@@ -120,8 +199,9 @@ function create_configuration_data()
 		var status = getButtonStatus(tr_elements[i].childNodes[5].childNodes[0]);
 		headers.push({action:action,header_name:header_name,header_value:header_value,comment:comment,apply_on:apply_on,status:status});
 		}
-	if (document.getElementById("debug_mode").checked) debug_mode=true ;	
-	var to_export = {format_version:"1.1",target_page:document.getElementById('targetPage').value,headers:headers,debug_mode:debug_mode};
+	if (document.getElementById("debug_mode").checked) debug_mode=true ;
+	if (document.getElementById("show_comments").checked) show_comments=true ;	
+	var to_export = {format_version:"1.1",target_page:document.getElementById('targetPage').value,headers:headers,debug_mode:debug_mode,show_comments:show_comments};
 	return JSON.stringify(to_export);
 }
 
@@ -306,7 +386,6 @@ function delete_line(line_number_to_delete)
 				document.getElementById("header_name"+i).value = document.getElementById("header_name"+j).value;
 				document.getElementById("header_value"+i).value = document.getElementById("header_value"+j).value;
 				document.getElementById("comment"+i).value = document.getElementById("comment"+j).value;
-				//document.getElementById("select_status"+i).value = document.getElementById("select_status"+j).value;
 				setButtonStatus(document.getElementById("activate_button"+i),getButtonStatus(document.getElementById("activate_button"+j)));
 				document.getElementById("apply_on"+i).value = document.getElementById("apply_on"+j).value;