manifest.json

{
    "name": "Utube to mp3/mp4",
    "short_name": "Utube Downloader",
    "version": "1.0",
    "description": "An extension that automates the process of downloading utube videos.",
    "permissions": [ 
      "https://www.youtube.com/*", 
      "declarativeContent",
       "storage"],
      "content_scripts":[
        {
           "matches":["https://ytmp3.cc/*"],
            "js": ["content.js"]
        }
    ],
    "background": {
        "scripts": ["background_new.js"],
        "persistent": false
      },
      "page_action": {
        "default_popup": "popup_new.html",
        "default_icon": {
            "16": "images/start16.png",
            "32": "images/start32.png",
            "48": "images/start48.png",
            "128": "images/start128.png"
          }
      },
      "icons": {
        "16": "images/start16.png",
        "32": "images/start32.png",
        "48": "images/start48.png",
        "128": "images/start128.png"
      },
    "manifest_version": 2
  }