Examine source code of YouTube NewTab

{
  "manifest_version": 2,
  "author": "doncato",
  "name": "__MSG_extensionName__",
  "version": "1.0",
  "default_locale": "en",
  "homepage_url": "https://github.com/doncato/youtube-embed-watcher",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "48": "icons/yt-ew-48.png",
    "96": "icons/yt-ew-96.png"
  },
  "page_action": {
    "default_icon": "icons/yt-ew-32.png",
    "default_title": "__MSG_contextMenuEmbed__",
    "show_matches": [
      "*://*.youtube.com/*"
    ],
    "hide_matches": [
      "*://*.youtube.com/embed/*"
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bb624da8-5464-4403-a575-85c9a2547b5a}"
    }
  }
}