CSS Transitions and Transforms
Adding 3D Effects with CSS
Activate 3D Space with perspective
Possibly old browser.. possibly doesn't have support? Dunno.
I don't think it's an old browser, if you follow the Teachers Notes link to MDN, it says Firefox 16 and up support these options.
I do seem to remember that there are some quirks with Firefox and the 3d placement, but it should give you items not where you expect, rather than not at all.
I believe the bigger issues were with trying to use percentages for positioning.
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