Examine source code of Select Container Tabs

{
  "author": "igorlogius",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {},
  "icons": {
    "128": "icon.svg"
  },
  "manifest_version": 2,
  "name": "Select Container Tabs",
  "permissions": [
    "tabs",
    "menus",
    "cookies"
  ],
  "version": "1.0.6",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0534349d-125c-44c2-b8a1-3c43f92f8020}"
    }
  }
}