Changes

There are some prefs which can customize the delta values or default action. These prefs are applied only to trusted events.

Starting Mozilla 17 (Firefox 17), following new prefs are available.

; mousewheel.with_win.action

: Customizing default action of "wheel" event. The value 0 means "Do nothing", 1 means "Scroll contents", 2 means "Go back or forward in the history", 3 means "Zoom in or out the contents". You cannot specify different action to vertical wheel operation and horizontal wheel operation because both deltaX and deltaY values can be non-zero same time. So, specifying different action doesn't make sense.

Mozilla 16 (Firefox 16) or earlier, following prefs are available.