Access specific cookies by domain/name in Firefox extension private window

Question

I had developed extension for firefox. In that i used

var cookieManager = Cc["@mozilla.org/cookiemanager;1"] .getService(Ci.nsICookieManager2); 
var count = cookieManager.getCookiesFromHost("example.com");

to read cookie. Noted in Access Specific cookie.

Now i tried same in private window but i can't able to read a single cookie info.

Kindly suggest me to read a cookie info in main.js, private window.

Comments

As far as I know cookie would not be accessible in the private window.