Now fixed, see https://bugzilla.mozilla.org/show_bug.cgi?id=364188
<div style="border: 1px solid red;">
<div>This should be in the red box.</div>
<param>
<div>This should be in the red box too (but breaks in Firefox 2.0).</div>
</div>
<div style="border: 1px solid blue;">
<div>This should be in the blue box.</div>
<table><tr><td><param></td></tr></table>
<div>This should be in the blue box too.</div>
</div>