4chan extension fix for Firefox 4

Don't know if this has been done already, but I fixed the 4chan Firefox extension to work with Firefox 4.0b2 and above:

http://www.mdn.fm/files/179169_jxnoo/4chan.v0.4.5.15.xpi

For those curious, I followed the example of this Greasemonkey Firefox 4.0b2 mod:

http://forums.mozillazine.org/viewtopic.php?f=19&t=1938173

Changes:
http://pastebin.org/383733

Another edit with update checking and the annoying "ReferenceError: chanmenu_RebuildMenus is undefined" popup disabled:

http://www.mdn.fm/files/185155_qoj6x/4chan.v0.4.5.15_unofficial_ff4_fix_v2.xpi