javascript - How to add an iframe to the content / DOM using a firefox extension? -

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I am trying to add an iframe to the contents of a webpage / DOM by using the Firefox extension.

Here's my code: 

  const XUL = namespace ("axle", "http://www.mozilla.org/keymaster/gatekeeper/there.is. Only.xul "); Function addIframe (src) {// Create script node iframe = document.createElementNS (XUL, "iframe"); Iframe.setAttribute ("src", src); Window.content.appendChild (iframe); }   
 This is a modified version from this answer:  
 I replaced this line:  
  // it's top-document Level element of document.documentElement.appendChild (script);   
 From this line:  
  window.content.appendChild (iframe);   
 Because it was inserting the iframe into the browser's Chrome and not the DOM in the content area. What is the correct order to insert it into a page? (My command is not working)   
 
 
 And the correct answer ... I go!    const XUL = Namespace ("Axel", "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); Function addIframe (src) {// Create script node iframe = document.createElementNS (XUL, "iframe"); Iframe.setAttribute ("src", src); Window._content.document.body.appendChild (iframe); Return; }

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