Examine source code of Popout

{
  "manifest_version": 2,
  "name": "Popout",
  "description": "Popout is simple extension that allows tabs to be opened in a separatem minimal window.",
  "version": "2.0",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "toggleIcon.js"
      ]
    }
  ],
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_title": "Popout to external window.",
    "default_icon": "icons/icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8658cdc-8198-4132-8dd0-f5508139637a}"
    }
  }
}