Examine source code of Steam Item Showcase Enhancer

{
  "manifest_version": 3,
  "name": "Steam Showcase Enhancer",
  "version": "1.1.1",
  "description": "Drag and drop items in Steam profile showcases to reorder them, and customize your avatar with live editing controls",
  "permissions": [],
  "host_permissions": [
    "https://steamcommunity.com/*",
    "https://avatars.fastly.steamstatic.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://steamcommunity.com/id/*/edit*",
        "https://steamcommunity.com/profiles/*/edit*"
      ],
      "js": [
        "content.js",
        "avatar-editor.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "steam-showcase-enhancer@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}