Something is not quite right. Why does the...when I...what the? Could they possibly have reversed the directions of the handy Ctrl+ScrollWheel zoom in/out feature?
And that does not bode well for the muscle memory of long-term users of the aforementioned feature like what I am. Still, about:config to the rescue; make the following change (default value is 1):
More riveting debate on this issue here: Mozilla Bug #141476
mousewheel.withcontrolkey.numlines = -1
I am in total agreement with the last commenter:
Er, yes. Carry on :)
Pulling the mousewheel DOWN is like PULLING the page toward you. Pushing the mousewheel UP is like PUSHING the page away from you. Think of how a fishing reel or a pulley works.