Examine source code of Shell Shockers io

{
  "name": "Shell Shockers io",
  "description": "Shell Shockers io. Would you prefer to play Shell Shockers ? Play this sport online totally free.",
  "version": "1.0",
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "bookmarks"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Shell Shockers io"
  }
}