page break only refers to printed media. It was included in css as of HTML 4.0.. That does not mean that all browsers support it, but I'm surprised that ie gets it and firefox does not. Have you passed it through a validator? (See the stickies at the top of this forum, make sure you go thru the css validator.)
Jared
Last I ever checked the page properties applied to visual and printed documents. But only block level elements. Without seeing the OP's code there is really no way to tell and it looks like he no longer cares about his question.