playlist-extension/manifest.json

{
  "manifest_version": 2,
  "name": "My Playlist Extension",
  "version": "1.0",
  "description": "An extension to manage youtube videos",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "contextMenus",
    "notifications",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "My Playlist Extension",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": ["background.js"]
  },
  "content_scripts": [
    {
      "matches": ["https://*.youtube.com/*"],
      "js": ["content_scripts/content.js"]
    }
  ]
}