Examine source code of EMarket-Referral

{
  "author": "Varun Sridharan",
  "developer": {
    "name": "Varun Sridharan",
    "url": "https://codecanyon.net/user/varunsridharan/portfolio"
  },
  "homepage_url": "https://github.com/technofreaky/EMarket-Referral",
  "applications": {
    "gecko": {
      "id": "varunsridharan23@gmail.com",
      "strict_min_version": "42.0"
    }
  },
  "manifest_version": 2,
  "name": "EMarket-Referral",
  "version": "1.1resigned1",
  "description": "Changes all urls in envato sites like (codecanyon.net,themeforest.net,videohive.net,graphicriver.net and more) with your envato user name",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.codecanyon.net/*",
        "*://*.themeforest.net/*",
        "*://*.videohive.net/*",
        "*://*.audiojungle.net/*",
        "*://*.graphicriver.net/*",
        "*://*.photodune.net/*",
        "*://*.3docean.net/*"
      ],
      "js": [
        "envato-referal.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ]
}