Examine source code of Universal Media Control

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "author": "Chris Rehfeld rehfeldchris@gmail.com",
  "name": "Universal Video Player Controls",
  "short_name": "VideoCtnrls",
  "appNameCode": "umpc",
  "description": "This extension lets you quickly seek video playback forwards and backwards.",
  "version": "1.4",
  "minimum_chrome_version": "41",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle",
      "all_frames": true,
      "match_about_blank": true,
      "js": [
        "umpc-script-injector.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "umpc-background.js"
    ],
    "persistent": false
  },
  "options_page": "options.html",
  "web_accessible_resources": [
    "umpc-communicator.js",
    "umpc-parent.js",
    "umpc-endpoint.js"
  ],
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/if_Arrow_Right_Square_16x16.png",
    "48": "icons/if_Arrow_Right_Square_48x48.png",
    "128": "icons/if_Arrow_Right_Square_128x128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e262a153-204b-4626-a6d1-b8a4a610b90e}"
    }
  }
}