Examine source code of Site Time Limit

{
  "manifest_version": 3,
  "name": "Site Time Limit",
  "version": "1.1.3",
  "description": "Limits visit time on certain sites. Right-click to add new sites.",
  "permissions": [
    "storage",
    "contextMenus",
    "scripting",
    "tabs",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "*://*.facebook.com/*",
    "*://*.youtube.com/*",
    "*://*.instagram.com/*",
    "*://*.tiktok.com/*",
    "*://*.nytimes.com/*",
    "https://www.amazon.com/gp/video*",
    "*://*.netflix.com/*"
  ],
  "optional_host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "service_worker.js"
    ]
  },
  "incognito": "spanning",
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*",
        "*://*.youtube.com/*",
        "*://*.instagram.com/*",
        "*://*.tiktok.com/*",
        "*://*.nytimes.com/*",
        "https://www.amazon.com/gp/video*",
        "*://*.netflix.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "assets/mascot.png",
        "blocked.html",
        "blocked.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_title": "Daily Site Limit",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "site-time-limit@example.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}