Rafael,

 

Do you set UploadType=Silverlight ?

 

The Firefox3.6 have bug on calculating the mouse position on the Silverlight object in an IFrame, that make the silverlight can't recieve the mouse click event and can't show the file browsing dialog.

 

So we disabled the silverlight on that condition.

 

If you set UploadType=Silverlight , the uploader will report the silverlight not installed.

 

So , I suggest you try this  at server side :

 

if( itisfirefox36 )
{

    uploader.UploadType=UploadType.Auto;
}

else

{

    uploader.UploadType=UploadType.Silverlight;
}

 

Regards,
Terry