Examine source code of Add to Kinopio

{
  "name": "Add to Kinopio",
  "description": "Collect and connect your thoughts",
  "homepage_url": "https://kinopio.club",
  "version": "3.2",
  "manifest_version": 2,
  "icons": {
    "16": "assets/icon-16.png",
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png",
    "128": "assets/icon-128.png",
    "512": "assets/icon-512.png",
    "1024": "assets/icon-1024.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Add to Kinopio",
    "default_popup": "index.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Y"
      }
    }
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{330deb4b-55e8-44d7-b4a4-560f5976dc2e}"
    }
  }
}