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qwerty
Asked: 2020-05-28 17:06:11 +0800 CST 2020-05-28 17:06:11 +0800 CST

Error setting value to a property of an object in a Firefox extension

  • 772

I am trying to change the value of the referrerobject property documentin a Firefox extension with the following code

//Test.js
  Object.defineProperty(document, "referrer", {
   get: function() {
     return "Test"
   },
   set: function(a){},
     configurable: false
  })

manifest.json

  {
     "manifest_version": 2,
     "name": "Test addon",
     "version": "beta",
     "description": "Spoofing browser data",
          "content_scripts": [
        {
          "matches": ["<all_urls>"],
          "js": ["test.js"],
          "run_at": "document_start"
        }
      ]
    }

I even tried with document.referrer=""but it doesn't work, if I execute another type of code like the typical example it document.body.style.border='1px solid red'works.

javascript

1 Answers

  1. Best Answer

    The referrer property of the document object is a property that is reported with the value of the HTTP header called "referer" (one less error).

    This header is a forbidden header, that is, a value that the browser will let you change programmatically. More info: https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_header_name

    Still, you can do something like this:

    console.log(document.referrer);
Object.defineProperty(document, "referrer", {get : function(){ return "PRUEBA"; }});
console.log(document.referrer);

    More info in this thread: https://stackoverflow.com/questions/9580575/how-to-manually-set-referer-header-in-javascript ,

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