Examine source code of Night Mode - Dark Theme

{
  "manifest_version": 2,
  "name": "Night Mode - Dark Theme",
  "version": "1.0.3",
  "description": "If you want light or if you want dark with just one click they are there and apart",
  "icons": {
    "48": "chromeicon.png",
    "128": "chromeicon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "112.0",
      "id": "simpleinc.help@gmail.com"
    }
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Night Mode"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}