The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

  * http://creativecommons.org/publicdomain/zero/1.0/ */

 function runTests() {

   // Visit the test page in the browser and tell it to set a cookie.

   let url = bgTestPageURL({ setGreenCookie: true });

   let tab = gBrowser.loadOneTab(url, { inBackground: false });

   let browser = tab.linkedBrowser;

   yield whenLoaded(browser);

   // The root element of the page shouldn't be green yet.

   let greenStr = "rgb(0, 255, 0)";

   isnot(browser.contentDocument.documentElement.style.backgroundColor,

         greenStr,

         "The page shouldn't be green yet.");

   // Cookie should be set now.  Reload the page to verify.  Its root element

   // will be green if the cookie's set.

   browser.reload();

   yield whenLoaded(browser);

   is(browser.contentDocument.documentElement.style.backgroundColor,

      greenStr,

      "The page should be green now.");

   // Capture the page.  Get the image data of the capture and verify it's not

   // green.  (Checking only the first pixel suffices.)

   yield bgCapture(url);

   ok(thumbnailExists(url), "Thumbnail file should exist after capture.");

   retrieveImageDataForURL(url, function ([r, g, b]) {

     isnot([r, g, b].toString(), [0, 255, 0].toString(),

           "The captured page should not be green.");

     gBrowser.removeTab(tab);

     removeThumbnail(url);

     next();

   });

   yield true;

 }