I just spent about an hour trying to work out why a CSS layout I was working on suddenly jumped left when I clicked on certain pages in Firefox, but not in Internet Explorer.
It turns out I made the silly mistake of forgetting Firefox pushes content left when the vertical scroll bar appears! ie. If you’re on a page that doesn’t have enough content to fill the screen and you then click on a page with more content than can fit on the screen, the vertical scroll bar that is automatically shown will push your content to the left!
I wonder if this feature can be turned off in FF? I know people love to bash IE but it seems to behave better with scroll bars than FF..