Examine source code of Non Gooner Kemono

{
  "name": "Non Gooner Kemono",
  "version": "1.0",
  "description": "A simple extension to remove the gooner theming.",
  "manifest_version": 3,
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://kemono.su/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "non-gooner-kemono@example.com"
    }
  }
}