Ok I had this NASTY problem with my mozilla firefox at my work computer. (Do I have to say that I'm using Linux? Yes! I DO! Anyway...) Whenever I scroll with my mouse up or down, firefox used to go back and forth in the history as I hit the top and bottom of the page. This might sound complicated, here I'll try to explain more...

Example: Surf couple of pages, and at the last page, read the article, and scroll all the way to the top of the article using your mouse scroll button... BOOM! Firefox goes to the previous page I was looking at! (Sometime couple of pages)

First I thought this was a bug... But then I thought some "genius" might have put this in firefox as a "feature"... I kinda fucked my brain to find a solution for this and nothing... NADA... RIEN!

At last I found this line in my xorg.conf file:

Option "ZAxisMapping" "4 5 6 7"

This somehow tells X to use scroller as a vertical scroller as soon as it hits to the top of the page (or bottom)... Most of the browsers have this vertical scroller functions mapped to the history browsing (back and forth)... So I changed the line to:

Option "ZAxisMapping" "4 5"

Now I'm happy