Examine source code of Dark Mode Reader

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "version": "1.0.0",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "alarms"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "lib/storage.js",
      "lib/license.js",
      "lib/scheduler.js",
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "darkmode-reader@firefox-extension",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup/popup.html",
    "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"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/darkmode.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "toggle-dark-mode": {
      "suggested_key": {
        "default": "Alt+Shift+D",
        "mac": "Alt+Shift+D"
      },
      "description": "Toggle Dark Mode Reader"
    }
  }
}