Examine source code of IVI Fixer

{
  "manifest_version": 2,
  "name": "IVI Fixer",
  "version": "1.0",
  "author": "GuAlSe",
  "description": "Исправляет сайт ivi.ru",
  "icons": {
    "48": "icon.png",
    "96": "icon2.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.ivi.ru/*"
  ],
  "applications": {
    "gecko": {
      "id": "ivi_fixer@gualse",
      "strict_min_version": "52.0"
    }
  },
  "background": {
    "scripts": [
      "fix.js"
    ]
  }
}