Examine source code of YT re:Watch

{
  "manifest_version": 3,
  "name": "YT re:Watch",
  "version": "5.1.0",
  "description": "Private local YouTube history, watch progress, channel subscriptions, analytics, and an in-browser feed. No account required.",
  "author": "Edin User",
  "homepage_url": "https://github.com/EdinUser/YouTubeLocalHistory",
  "browser_specific_settings": {
    "gecko": {
      "id": "fallenangelbg@protonmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "scripting",
    "contextMenus"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "indexeddb-storage.js",
      "storage.js",
      "local-subscription-actions.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "indexeddb-storage.js",
        "storage.js",
        "local-subscription-actions.js",
        "content-css.js",
        "content-url.js",
        "content-import.js",
        "content-playlists.js",
        "content-info.js",
        "content-thumbnails.js",
        "content-messages.js",
        "content.js",
        "content-subscriptions.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icon48.png"
      ],
      "matches": [
        "*://*.youtube.com/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "YT re:Watch"
  },
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "default_locale": "en"
}