Bug when paste from Word and Firefox 3

If I copy some text from Word and paste in a tinymce using Firefox3 (using or not the "paste from word" button) it will paste some html comments and code like this:

<!--[if gte mso 9]><xml> Normal   0         false   false   false                             MicrosoftInternetExplorer4 </xml><![endif]--><!--[if gte mso 9]><xml> </xml><![endif]--><!--[if !mso]>
<object  classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui>
</object>
<mce:style><!  st1\:*{behavior:url(#ieooui) } -->
<p>&nbsp;</p>
<!--[endif]-->
<p><!--  --></p>
<!--[if gte mso 10]> <mce:style><!   /* Style Definitions */  table.MsoNormalTable     {mso-style-name:"Table Normal";     mso-tstyle-rowband-size:0;     mso-tstyle-colband-size:0;     mso-style-noshow:yes;     mso-style-parent:"";     mso-padding-alt:0cm 5.4pt 0cm 5.4pt;     mso-para-margin:0cm;     mso-para-margin-bottom:.0001pt;     mso-pagination:widow-orphan;     font-size:10.0pt;     font-family:"Times New Roman";     mso-ansi-language:#0400;     mso-fareast-language:#0400;     mso-bidi-language:#0400;} -->

This code will not be shown on tinymce editor, but will appear on nodes. And, as I've read, this issue not only involves tinyMCE, but any other WYSIWYG editor.

You can find more info in the next links:
http://forums.mozillazine.org/viewtopic.php?f=38&t=704435&start=0&st=0&s...
http://tinymce.moxiecode.com/punbb/viewtopic.php?id=12405
http://tinymce.moxiecode.net/punbb/viewtopic.php?id=12385

Thanks!