Mouse wheel not working in firefox but only on one display

"Root cause found! Display ordering and the 'Primary Display' in windows!

In the 'Display Properties' dialog on windows,
all 'displays' to the 'left' of the 'primary display' are unable to use the scrollwheel in firefox.

Change the order of displays so that '1' is the left-most display and it works!
Selecting the left-most display, and checking the 'Use this device as the primary monitor' is a pretty good workaround.

I opened a bug with the firefox folks
(but with appropriately minor severity as there is a workaround):
bugzilla.mozilladotorg/show_bug.cgi?id=512794"

"One could try looking here for a discussion about similar symtoms...
alas did not fix my specific issue, however.

http://support.mozilla.com/tiki-view_forum_thread.php?forumId=1&comments_parentId=9011"