Examine source code of Bookmark for YouTube™

{
  "manifest_version": 2,
  "name": "Bookmark for YouTube™",
  "version": "1.0",
  "description": "Saves the last timestamp when viewing a YouTube video and resumes it when loading that video again.",
  "icons": {
    "48": "icons/icon48.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "injected.js"
  ]
}