Firefox 3.6.2では見えない

最近こんなエラーに悩まされています。

エラー: uncaught exception: [Exception... "Node was not found" code: "8" nsresult: "0x80530008 (NS_ERROR_DOM_NOT_FOUND_ERR)" location: "http://www.capcom.co.jp/monsterhunter/P3rd/js/swfobject.js Line: 4"]

エラー: uncaught exception: [Exception... "Node was not found" code: "8" nsresult: "0x80530008 (NS_ERROR_DOM_NOT_FOUND_ERR)" location: "http://www.mh-frontier.jp/preview/season8/js/swfobject.js Line: 4"]

エラー: uncaught exception: [Exception... "Node was not found" code: "8" nsresult: "0x80530008 (NS_ERROR_DOM_NOT_FOUND_ERR)" location: "http://www.nintendo.co.jp/wii/rk3j/js/swfobject.js Line: 4"]

エラー: uncaught exception: [Exception... "Node was not found" code: "8" nsresult: "0x80530008 (NS_ERROR_DOM_NOT_FOUND_ERR)" location: "http://seiga.nicovideo.jp/js/swfobject.js?2.2 Line: 4"]

どうやらswfの呼び出し方の問題で、このエラーはOperaやInternet Explorerでは起きない。