elRTE error 0x80004005 in Firefox

Error: uncaught ex开发者_开发知识库ception: [Exception... 
"Component returned failure code: 0x80004005 
(NS_ERROR_FAILURE) [nsIDOMNSHTMLDocument.execCommand]"  
nsresult: "0x80004005 
(NS_ERROR_FAILURE)"  
location: "JS frame :: http://localhost/mypage/admin/elrte/js/elrte.min.js
 :: <TOP_LEVEL> :: line 34"  data: no]

Why am I getting this error in Firefox, with the elRTE plugin? I didn't try it in other version of Firefox. But in Firefox 5 I'm getting this error?

display:none in style parent div occurs this problem, I explain what I want to say in here,

http://elrte.org/redmine/boards/4/topics/3279