var w=window.open('http://www.google.com/','', 'width=100,height=100');
w.resizeTo(500,500);
w.resizeBy(50,50);
does not work on Firefox with the WOT addon enabled. I did this test only with the WOT addon enabled (no other addon enabled).
By disabling the WOT addon everything works as expected.
http://www.mywot.com/en/forum/38626-wot-for-firefox-messes-up-all-popups-non-malicious