On New Identity the new window opens at a different location before the old one gets closed

  OpenBrowserWindow();

  torbutton_log(3, "New identity successful");

  // Run garbage collection and cycle collection after window is gone.
  // This ensures that blob URIs are forgotten.
  window.addEventListener("unload", function (event) {
    torbutton_log(3, "Initiating New Identity GC pass");
    // Clear out potential pending sInterSliceGCTimer:
    m_tb_domWindowUtils.runNextCollectorTimer();

    // Clear out potential pending sICCTimer:
    m_tb_domWindowUtils.runNextCollectorTimer();

    // Schedule a garbage collection in 4000-1000ms...
    m_tb_domWindowUtils.garbageCollect();

    // To ensure the GC runs immediately instead of 4-10s from now, we need
    // to poke it at least 11 times.
    // We need 5 pokes for GC, 1 poke for the interSliceGC, and 5 pokes for CC.
    // See nsJSContext::RunNextCollectorTimer() in
    // https://mxr.mozilla.org/mozilla-central/source/dom/base/nsJSEnvironment.cpp#1970.
    // XXX: We might want to make our own method for immediate full GC...
    for (let poke = 0; poke < 11; poke++) {
       m_tb_domWindowUtils.runNextCollectorTimer();
    }

    // And now, since the GC probably actually ran *after* the CC last time,
    // run the whole thing again.
    m_tb_domWindowUtils.garbageCollect();
    for (let poke = 0; poke < 11; poke++) {
       m_tb_domWindowUtils.runNextCollectorTimer();
    }

    torbutton_log(3, "Completed New Identity GC pass");
  });

  // Close the current window for added safety
  window.close();