Examine source code of Econoread

{
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  "name": "Econoread",
  "version": "1.1resigned1",
  "description": "Read economist.com with no hassle",
  "icons": {
    "32": "icons/econoread-32.png",
    "48": "icons/econoread-48.png",
    "64": "icons/econoread-64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.economist.com/*"
      ],
      "js": [
        "econoread.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{aab0a387-6b51-4876-b806-28521af85569}"
    }
  }
}