New K-M window opens as ...
If you choose in perferences "New Window should display: Blank Page" and there is still a URL in the URL box, the new window opens with that URL nonetheless as with "New Window should display: URL" still checked.
The value in:
user_pref("kmeleon.display.newWindowOpenAs", 0);
has changed to 0 (for Blank Page).
But right on the next line is still for example:
user_pref("kmeleon.display.newWindowURL",
http://www.alltheweb.com/"
and with that "alltheweb" starts with the next (new) page.
My guess is, the line
user_pref("kmeleon.display.newWindowURL",
http://www.alltheweb.com/"
and with that the URL box as well should be altered (cleared) automatically when choosen Blank Page.
Kurt