Examine source code of Video Time Manager

{
  "manifest_version": 3,
  "name": "Video Time Manager",
  "description": "What a time to be alive!",
  "version": "4.0.1",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "64": "icon-64.png",
    "128": "icon-128.png"
  },
  "default_locale": "en",
  "homepage_url": "https://github.com/avi12/video-time-manager-feedback",
  "action": {},
  "permissions": [
    "storage",
    "unlimitedStorage",
    "identity",
    "alarms",
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "https://*.youtube.com/*"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'; report-uri https://disciplined-starling-709.convex.site/errors/report"
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "strip-youtube-tag-fetch-frame-headers",
        "enabled": true,
        "path": "rules/strip-youtube-tag-fetch-frame-headers.json"
      }
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "fonts/Inter.ttf",
        "fonts/RobotoFlex.woff2",
        "fonts/RobotoMono.woff2",
        "watch-time-sorter.js",
        "models/*",
        "wasm/*"
      ],
      "matches": [
        "https://*.youtube.com/*"
      ]
    },
    {
      "resources": [
        "content-scripts/dashboard.css"
      ],
      "matches": [
        "https://music.youtube.com/*",
        "https://www.youtube.com/*"
      ]
    }
  ],
  "author": "Avi <avi6106@gmail.com>",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-time-manager@avi12.com",
      "strict_min_version": "147.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "developer": {
    "name": "Avi",
    "url": "https://github.com/avi12/video-time-manager-feedback"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://music.youtube.com/*",
        "https://www.youtube.com/*"
      ],
      "css": [
        "content-scripts/DashboardTriggerStyles.css"
      ],
      "js": [
        "content-scripts/DashboardTriggerStyles.js",
        "content-scripts/dashboard.js",
        "content-scripts/vtm-tracker.js"
      ]
    },
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "content-scripts/tag-fetch-proxy.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "https://music.youtube.com/*",
        "https://www.youtube.com/*"
      ],
      "js": [
        "content-scripts/vtm-main.js"
      ],
      "world": "MAIN"
    }
  ]
}