Examine source code of Floating 4 YouTube

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "short_name": "Floating for YouTube™",
  "name": "Floating for YouTube™ Extension",
  "description": "Open YouTube video in Floating Mini Player for YouTube™.",
  "version": "0.7.4resigned1",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_icon": {
      "19": "images/icon-19.png",
      "38": "images/icon-38.png"
    },
    "default_title": "Open in Floating for YouTube™"
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "64": "images/icon-64.png",
    "128": "images/icon-128.png",
    "256": "images/icon-256.png",
    "512": "images/icon-512.png"
  },
  "permissions": [
    "management",
    "webNavigation",
    "activeTab",
    "*://*.youtube.com/*"
  ],
  "web_accessible_resources": [
    "scripts/inject.player.js",
    "scripts/inject.watch.js",
    "scripts/inject.watchlater.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.youtube-nocookie.com/*"
      ],
      "css": [
        "styles/inject.css"
      ],
      "js": [
        "scripts/inject.js"
      ],
      "run_at": "document_end"
    },
    {
      "all_frames": true,
      "matches": [
        "*://*.youtube.com/embed/*"
      ],
      "js": [
        "scripts/inject.embed.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd101c17-b92d-4ffe-9bef-7618e9bcb56e}"
    }
  }
}