gBrowser load event: it is possible to get a document where link has been clicked?

[fedors...@gmail.com]

Hello everyone!
I am writing a firefox Extension (xul). Processing the loading of document as follows:

this._loadHandler = function(event) {
...
};

gBrowser.addEventListener("load", this._loadHandler, true);

It is necessary to get a reference to document where link to event.target has been clicked. (If event.target document has been opened without using a link, this reference is null).

I tried to use window.opener, but it always returned null.

Is there a way to solve this problem?

[subrat...@gmail.com]