Examine source code of YouTube Time Manager

{
  "icons": {
    "16": "icon16.plasmo.2577fc03.png",
    "32": "icon32.plasmo.d583dc1e.png",
    "48": "icon48.plasmo.e0fcfb1d.png",
    "64": "icon64.plasmo.e6259081.png",
    "128": "icon128.plasmo.96a1ede9.png"
  },
  "manifest_version": 3,
  "action": {
    "default_icon": {
      "16": "icon16.plasmo.2577fc03.png",
      "32": "icon32.plasmo.d583dc1e.png",
      "48": "icon48.plasmo.e0fcfb1d.png",
      "64": "icon64.plasmo.e6259081.png",
      "128": "icon128.plasmo.96a1ede9.png"
    },
    "default_popup": "popup.html"
  },
  "version": "3.1.16",
  "author": "avi12 <avi6106@gmail.com>",
  "name": "YouTube Time Manager",
  "description": "Productivity is key.",
  "homepage_url": "https://github.com/avi12/youtube-time-manager-feedback",
  "background": {
    "scripts": [
      "static/background/index.js"
    ]
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "identity"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "yttm-tracker.956b390e.js"
      ],
      "css": []
    },
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "dashboard-trigger-init.eaa57ed8.js"
      ],
      "css": [
        "font.61971a5f.css",
        "dashboard-trigger-init.2e168458.css"
      ]
    }
  ],
  "host_permissions": [
    "https://*.youtube.com/*"
  ],
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoZAyFXAIBZxMxXQo4tEdxpGsIQg8HuGg7tNMXOtfHOJOEuToMtAT6SsVMkE5spNEoMMFrp1NENuXyC28UWgqWSDT1MiN6mz1rX8SKz5tM5X/3rvexPBE8254+ELBCTdhbgOQ/UX6UctL8hf7yDU0qdegG4CE5ODE5EAp75rpnadB4r7H3H1CrXKcDtlXVRXfQAXFWPHfjAdc03oKOhaZBg+b54Vw0Oc3uBfu5iHwUE4euzHlE3qgosrogPDdY9ldldF8wB5kPJ12F/X9whedWn3ZRJ1n6Sq38ANuBbYl1X6hw1Lf0MgxKRnUmcyyNwVdZMIeHJNP4VmadbQ13JwfjwIDAQAB",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-time-manager@avi12.com"
    }
  },
  "web_accessible_resources": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "resources": [
        "Inter-VariableFont_slnt,wght.79570758.ttf",
        "vidmatch-promotion.12feb6dc.png",
        "person.d4cac969.svg",
        "visibility.4adf336b.svg",
        "visibility_off.4ca37236.svg",
        "profile-picture.308ce01a.jpg",
        "update.0af9942e.svg",
        "my_location.71d4e8a7.svg",
        "dashboard-trigger-init.b7e8c233.css",
        "dashboard-trigger-init.f4f75dcf.css",
        "dashboard-trigger-init.33b86f0e.css",
        "spring-light.cce47ddd.svg",
        "spring-dark.e751f460.svg",
        "dashboard-trigger-init.4c03fc07.jpg",
        "dashboard-trigger-init.4854768c.svg",
        "dashboard-trigger-init.c7726ed7.svg",
        "dashboard-trigger-init.469666bb.css",
        "dashboard-trigger-init.b31b585c.svg",
        "dashboard-trigger-init.9a2f923d.css",
        "dashboard-trigger-init.cd53c947.svg",
        "dashboard-trigger-init.6f222f2e.css",
        "dashboard-trigger-init.66ca9226.svg",
        "dashboard-trigger-init.a91c31f4.css"
      ]
    }
  ]
}