Firefox 3 on Windows using wmode transparent or opaque introduces a new default style for the object element; it treats it like an active link.

This Firefox implementation deviates from Firefox 3 on Mac, previous Firefox versions on Windows and the default style for the embed element, so it is therefore likely to be a Firefox bug.

The following style rule in the head of your web page should solve this issue:

<style type="text/css" media="screen">

object { outline:none; }

</style>