Using Cookies with Firefox Extensions and JavaScript

I’m working on a Firefox Extension at the moment and I had to read and write cookies with that extension. To make a long story short, this is how you do it (in the JavaScript code of your extension):

var ios = Components
  .classes["@mozilla.org/network/io-service;1"]
  .getService(Components.interfaces.nsIIOService);
var cookieUri = ios
  .newURI("http://www.uri_of_the_cookies.com/",
  null, null);
var cookieSvc = Components
  .classes["@mozilla.org/cookieService;1"]
  .getService(Components.interfaces.nsICookieService);
var cookie = cookieSvc.getCookieString(cookieUri, null);
if (cookie == null || cookie.length < 1) {
//no cookie set for this uri
} else {
var cookieArray = cookie.split(”; ”);
//loop through the different cookies
//(key/value pairs) for this URI
for (var i = 0; i < cookieArray.length; i++) {
var kvPair = cookieArray[i].split(”=”);
if (kvPair.length > 1 &&
  kvPair[0] == "NameOfTheCookieImLookingFor" &&
  kvPair[1].length > 0) {
    //the value is in kvPair[1]

    break;
}
}
}

So what about writing cookies? Easy:

var ios = Components
  .classes["@mozilla.org/network/io-service;1"]
  .getService(Components.interfaces.nsIIOService);
var cookieUri = ios
  .newURI("http://www.uri_of_the_cookies.com/",
  null, null);
var cookieSvc = Components
  .classes["@mozilla.org/cookieService;1"]
  .getService(Components.interfaces.nsICookieService);
cookieSvc.setCookieString(cookieUri, null,
“key=value”, null);

And last but not least: What about removing cookies? Quite easy as well:

Components.classes["@mozilla.org/cookiemanager;1"]
  .getService(Components.interfaces.nsICookieManager)
  .remove(".mydomain.com", //the domain
          "nameOfCookie",  //the name of the cookie
          "/path",         //the path of the cookie, ie "/"
          false);          //should cookies from this host
                           //be blocked permanently?

Components.classes["@mozilla.org/cookiemanager;1"]
  .getService(Components.interfaces.nsICookieManager)
  .removeAll();

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