Created attachment 500564 [details]
Steps to reproduce:
1. Load the testcase.
2. Shift+click the link.
This should create a new browser window with a download dialog in front.
3. In the initial browser window, File > Quit.
###!!! ASSERTION: nsWindow::EnableDragDrop() called after Destroy(): 'mWnd',
file widget/src/windows/nsWindow.cpp, line 3054
Created attachment 500566 [details]
This is a different error but is fixed by the same fix as Bug 671792.
This testcase should be tested once Bug 671792 gets merged in.
This was fixed inside the patch of Bug 671792
I verified that it is fixed with the following nightly build: