Examine source code of Nocturne - Dark Web Theme

{
  "manifest_version": 3,
  "name": "DarkStyle",
  "version": "0.1",
  "description": "Clean dark mode for every website – consistent, readable and eye-friendly.",
  "permissions": [
    "storage",
    "scripting",
    "activeTab"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "64": "icon64.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "64": "icon64.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "k3tzDn@proton.me",
      "strict_min_version": "109.0"
    }
  }
}