firefox addon - why can't I create file in the folder with xpcom -

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i haved created folder , code that

 var file = components.classes["@mozilla.org/file/local;1"]          .createinstance(components.interfaces.nsilocalfile);     var fostream = components.classes["@mozilla.org/network/file-output-stream;1"]              .createinstance(components.interfaces.nsifileoutputstream);  filepath = path;  file.initwithpath(filepath);  if(file.exists() == false ) {    file.create(0x01, 0644);   }

but when create file in folder , there error show that

error: uncaught exception: 

[exception... "component returned failure code: 0x80520015 (ns_error_file_access_denied) [nsilocalfile.create]"  nsresult: "0x80520015 (ns_error_file_access_denied)"

anyone can me please?

change directory permissions 0755


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