Examine source code of DarkPage Switch

{
  "manifest_version": 2,
  "name": "DarkPage Switch",
  "version": "1.0",
  "description": "Toggle between light and dark mode on any webpage with one click.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon.png"
    },
    "default_title": "DarkPage Switch"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5ea34a3-e0d4-469d-858c-54bc0d0f24f3}"
    }
  }
}