How to use modules in Firefox addon development

Question

Trying to create a firefox addon that accesses the browser cookies. Following googled tutorials I've written the following function but looks like the Services.jsm is not accessible?

Components.utils.import("resource://gre/modules/Services.jsm");

var myExtension = {
myListener: function(evt) {

    //I get here
    alert("Received from web page: " +
    evt.target.getAttribute("attribute1") + "/" +
    evt.target.getAttribute("attribute2"));

    //I dont see anything dumped 
    let enum = Services.cookies.getCookiesFromHost("example.com");
    while (enum.hasMoreElements()) {
        var cookie = e.getNext().QueryInterface(Ci.nsICookie2);
        dump(cookie.host + ";" + cookie.name + "=" + cookie.value + "\n");
    }

  }
}
document.addEventListener("MyExtensionEvent", function(e) { myExtension.myListener(e); }, false, true);

Answer 1

Thanks @Shakur I didn't catch that e and yep you're right it needs to be fixed to enum.

I'm not familiar with cookie service, I would have to read up on it but you're on right track.

This is because you have not defined Ci you use Ci in the while loop. You can replace Ci with Components.interfaces and it should fix it up. :) If you want to use the C* short forms it is typically done by adding to the top: const {Cc:classes, Cu:utils, Ci:interfaces, Cr:results, CC: Constructor} = Components as seen in this example here: https://codereview.stackexchange.com/questions/56821/improvements-to-nsizipreader-and-nsiscriptableinputstream/56824#56824