hello, could you please provide more context to your question, like what are you attempting to do when the error is opening up...?

Are you the developer? It is undefined because you cannot use it. Why do you need to use it?

Hi,

We have a application which works only in internet explorer 8 and now working in IE-11 with compatibility mode. we want to make this application running in firefox.the functionality where we use netscape.security.PrivilegeManager is to copy link to clipboard.

following code is written currently :

      netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
  
  var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
  if (!clip) return;

  var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
  if (!trans) return;
  
  trans.addDataFlavor('text/unicode');
  
  var str = new Object();
  var len = new Object();
  
  var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
  
  var copytext=urlToCopied;
  
  str.data=copytext;
  
  trans.setTransferData("text/unicode",str,copytext.length*2);
  
  var clipid=Components.interfaces.nsIClipboard;
  
  if (!clip) return false;
  
  clip.setData(trans,null,clipid.kGlobalClipboard);
  
  }

alert("Following URL was copied to your clipboard:\n\n" + urlToCopied);

Could you please help us for any suggestion.

Thanks

This code doesn't work in Firefox since many many years.

For copying URLs to clipboard you could use an extension, for instance:

• https://addons.mozilla.org/firefox/addon/url2clipboard/
• https://addons.mozilla.org/firefox/addon/autocopyselection2clipboard/
• https://addons.mozilla.org/firefox/addon/copy-link-url-we/
• https://addons.mozilla.org/firefox/addon/copy-text-link/
• https://addons.mozilla.org/firefox/addon/extended-link-copy/

It's just text? For a contemporary code example, see:

https://hackernoon.com/copying-text-to-clipboard-with-javascript-df4d4988697f

Thanks every one.my issue has been solved with different way.