firefox object height ignored when data

Question

I have a flash video loading in a modal window. It works in others browsers but not Firefox. Firefox opens the modal window to the correct width of the object, but with no height. I have come to learn that Firefox does not recognize <param> and instead uses the data attribute. However, when I remove this attribute, the modal opens with correct height. What is going on? Here is the code the modal window loads:

<object width="720" height="520" type="application/x-shockwave-flash" data="proxymovie.SWF?file=proxymovie.MP4">
    <param name="movie" value="proxymovie.SWF?file=proxymovie.MP4" />
    <img src="images/poster.png" width="720" height="480" alt="" title="Download the video below" />
</object>

Answer 1

Firefox ignores object and uses embed. Do you have the height set on the embed tag?

Answer 2

I tried embed earlier to no avail.

<object width="720" height="520" type="application/x-shockwave-flash" data="proxymovie.SWF?file=proxymovie.MP4">
<param name="movie" value="proxymovie.SWF?file=proxymovie.MP4" />
<embed src="proxymovie.swf?file=proxymovie.mp4" width="720" height="520" />

I should clarify that the flash video is there and I can scroll down, but it only shows a sliver of the top in the modal window.