I've just came from a Windows system (in fact, I'm dual booting Ubuntu 12.04 and Win7), and in my Firefox installation back then, when I pressed the middle mouse button (mouse wheel), it displayed a circle that I could move the pointer away from to navigate around the page in a 2-dimensional scrolling. In Ubuntu's Firefox, I don't see this behaviour. Is there a way to enable this feature? I beleive it would require a different version of Firefox, because when I search
about:config, ot only has
middlemouse.scrollbarPosition;true middlemouse.paste;true middlemouse.openNewWindow;true middlemouse.contentLoadURL browser.tabs.opentabfor.middleclick;true
I'm using the canonical release 23.0, by the way.
EDIT: Downloaded a clean install from firefox.com and nothing changed. Maybe it's a system bug?