Bug 670341 - about:permissions queries hosts for favicons, r=mak

   *        A callback function that takes a favicon image URL as a parameter.

   */

  getFavicon: function Site_getFavicon(aCallback) {

    let callbackExecuted = false;

    function faviconDataCallback(aURI, aDataLen, aData, aMimeType) {

      // We don't need a second callback, so we can ignore it to avoid making

      // a second database query for the favicon data.

      if (callbackExecuted) {

        return;

      }

      try {

        aCallback(aURI.spec);

        // Use getFaviconLinkForIcon to get image data from the database instead

        // of using the favicon URI to fetch image data over the network.

        aCallback(gFaviconService.getFaviconLinkForIcon(aURI).spec);

        callbackExecuted = true;

      } catch (e) {

        Cu.reportError("AboutPermissions: " + e);

      }

    }

    // Try to find favicion for both URIs. Callback will only be called if a

    // favicon URI is found, so this means we'll always prefer the https favicon.

    gFaviconService.getFaviconURLForPage(this.httpURI, faviconDataCallback);

    // favicon URI is found. We'll ignore the second callback if it is called,

    // so this means we'll always prefer the https favicon.

    gFaviconService.getFaviconURLForPage(this.httpsURI, faviconDataCallback);

    gFaviconService.getFaviconURLForPage(this.httpURI, faviconDataCallback);

  },

  /**