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[quote=adodupan]
JamesD, i hope this example will help you to learn how to use kmprefs in javascript.
Green line is disabled code, blue is new or changed code.
root\components file donottrack.js
[size="10px"]
/*
donottrack.js
Jonathan Mayer - jmayer@stanford.edu

An XPCOM component that adds a Do Not Track header to all web requests.

v0.02 - 1/30/11
Updated header.

v0.01 - 10/26/10

Acknowledgement: Closely follows Mozilla's example XPCOM HTTP header modification component, https://developer.mozilla.org/en/Setting_HTTP_request_headers.
*/

[color=green]//  var DoNotTrackHeaderName = "DNT";
//  var DoNotTrackHeaderValue = "1";[/color]

function DNTHTTPListener() { }

DNTHTTPListener.prototype =
{
	observe: function(subject, topic, data)
	{
		if (topic == "http-on-modify-request")
		{
			var httpChannel = subject.QueryInterface(Components.interfaces.nsIHttpChannel);
[color=blue]
var dntprefs = Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefService).getBranch('navigator.');[/color]
[color=green]
//  httpChannel.setRequestHeader(DoNotTrackHeaderName, DoNotTrackHeaderValue, false);[/color]

[color=blue]httpChannel.setRequestHeader("DNT", dntprefs.getIntPref("doNotTrack"), false);[/color]

return;
		}

else if (topic == "app-startup" || topic == "profile-after-change")
		{
			var observerService = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
			observerService.addObserver(this, "http-on-modify-request", false);
			return;
		}
	},
 
	QueryInterface: function (iid)
	{
		if (iid.equals(Components.interfaces.nsIObserver) || iid.equals(Components.interfaces.nsISupports))
			return this;
		Components.returnCode = Components.results.NS_ERROR_NO_INTERFACE;
		return null;
	},
};

var myModule =
{
	registerSelf: function (componentManager, fileSpec, location, type)
	{
		var componentManagerI = componentManager.QueryInterface(Components.interfaces.nsIComponentRegistrar);
		componentManagerI.registerFactoryLocation(this.myCID, this.myName, this.myProgID, fileSpec, location, type);
		var categoryManager = Components.classes["@mozilla.org/categorymanager;1"].getService(Components.interfaces.nsICategoryManager);
		categoryManager.addCategoryEntry("app-startup", this.myName, this.myProgID, true, true);
	},

getClassObject: function (compMgr, cid, iid)
	{
		return this.myFactory;
	},

myCID: Components.ID("{b835ff9f-3fdd-47be-b216-d1e8c09252f5}"),

myProgID: "@donottrack.us/DNTHTTPListener;1",

myName:	 "Do Not Track HTTP Listener",

myFactory:
	{
		QueryInterface: function (aIID)
		{
			if (!aIID.equals(Components.interfaces.nsISupports) && !aIID.equals(Components.interfaces.nsIFactory))
				throw Components.results.NS_ERROR_NO_INTERFACE;
			return this;
		},
		createInstance: function (outer, iid)
		{
			return new DNTHTTPListener();
		}
	},

canUnload: function(compMgr)
	{
		return true;
	}
};

function NSGetModule(compMgr, fileSpec)
{
	return myModule;
}
[/size]

Macrolanguage, just for menu item.
root\macros file doNotTrack.kmm
[size="10px"][color=blue]
$OnInit=$OnInit."_doNotTrack_01;";
$macroModules=$macroModules."doNotTrack;";

_doNotTrack_01{
	setmenu("&Privacy",inline,_doNotTrack,_Privacy_Settings);
	setmenu(_doNotTrack,macro,"I do not want to be tracked",_doNotTrack_02);
}
_doNotTrack_02{
	macroinfo=_("Toggle Do Not Track");
	menuchecked=getpref(INT,"navigator.doNotTrack")==1;
	togglepref(INT,"navigator.doNotTrack",0,1);
}
[/color][/size]

It is necessary to create a preference INT 'navigator.doNotTrack', or in the 
root\defaults\pref create a file doNotTrack.js
[size="10px"][color=blue]
pref("navigator.doNotTrack",1);[/color][/size]

Regards[/quote]

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