hello, try this one: http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=9454839&linkID=9242099 ''edit: just tested it myself now & after the installation the plugin in question won't show up in firefox' plugin list - the site also looks quite outdated (it refers to netscape navigator, which was used a decade ago) so this might indicate this plugin is deprecated and you won't be able to get it running on current firefox versions.''