Examine source code of Checkprice.io

{
  "author": "Khakhalev Nikita",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "20": "icons/logo-20x20.png",
      "38": "icons/logo-38x38.png"
    },
    "default_title": "Checkprice"
  },
  "content_scripts": [
    {
      "all_frames": false,
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "match_about_blank": true,
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "description": "Сервис мониторинга цен от Checkprice.io",
  "icons": {
    "16": "icons/checkprice-16x16.png",
    "48": "icons/checkprice-48x48.png",
    "128": "icons/checkprice-128x128.png"
  },
  "manifest_version": 2,
  "name": "Checkprice.io",
  "permissions": [
    "cookies",
    "http://*/*",
    "https://*/*",
    "tabs"
  ],
  "short_name": "Мониторинг цен от Checkprice.io",
  "version": "1.1.9"
}