diff --git a/NEWS b/NEWS
index 1a221172..104e8397 100644
--- a/NEWS
+++ b/NEWS
@@ -21,6 +21,7 @@ NEWS ( CHANGELOG and HISTORY )                                     HTMLPurifier
 - Fix broken test suite in versions of PHP without spl_autoload_register()
 - Fix degenerate case with YouTube filter involving double hyphens.
   Thanks Pierre Attar for reporting.
+- Fix YouTube rendering problem on certain versions of Firefox.
 . Add verbose mode to command line test runner, use (--verbose)
 . Turn on unit tests for UnitConverter
 . Fix missing version number in configuration %Attr.DefaultImageAlt (added 3.2.0)
diff --git a/library/HTMLPurifier/Filter/YouTube.php b/library/HTMLPurifier/Filter/YouTube.php
index 17c38d65..aca972f6 100644
--- a/library/HTMLPurifier/Filter/YouTube.php
+++ b/library/HTMLPurifier/Filter/YouTube.php
@@ -23,10 +23,9 @@ class HTMLPurifier_Filter_YouTube extends HTMLPurifier_Filter
 
     protected function postFilterCallback($matches) {
         $url = $this->armorUrl($matches[1]);
-        return '<object width="425" height="350" '.
+        return '<object width="425" height="350" type="application/x-shockwave-flash" '.
             'data="http://www.youtube.com/v/'.$url.'">'.
             '<param name="movie" value="http://www.youtube.com/v/'.$url.'"></param>'.
-            '<param name="wmode" value="transparent"></param>'.
             '<!--[if IE]>'.
             '<embed src="http://www.youtube.com/v/'.$url.'"'.
             'type="application/x-shockwave-flash"'.