The page properties of BlueVoda do not really set the page size of the output HTML, but only the workspace for BlueVoda itself.
The real page size is determined only by the contents of your page, so the objects on the right border and bottom, should set the page size in FireFox so they all fit.
FireFox still has lots of bugs related to layout.
I don't know how you can adjust FireFox to make it look better, but you can try to add an invisible image in the border area to 'stretch' your page up a little.
Usually a transparent gif of 1x1 is used for this.
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