When I try to click on the mouse wheel to close a tab i Firefox I often tilt it instead by mistake. The result is that the tabs are scrolled (I have many tabs open). How can I disable this behavior?
EDIT: Note that this only happens with many tabs open. If there are too many tabs open, Firefox starts to hide them (and displays two arrows to scroll through them). You can see this if you hit Ctrl-T repeatedly until there are enough tabs.