Examine source code of Youtube-Workflow

{
  "manifest_version": 2,
  "name": "Youtube-Workflow",
  "version": "1.5",
  "description": "Make your focus powerful and strong",
  "icons": {
    "48": "icons/16x16.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/16x16.png",
    "default_title": "Workflow",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "implement.js"
      ]
    }
  ]
}