Examine source code of Steam Artwork Hub Essentials

{
  "name": "Steam Artwork Hub Essentials",
  "description": "Steam Artwork Hub Essentials is an extension for Steam that allows you to upload long artworks, screenshots, workshops and guides.",
  "version": "1.0.5",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "{bb53f7e1-a291-485a-88d7-2dca7b20c3a7}"
    }
  },
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "https://steamcommunity.com/*",
        "https://store.steampowered.com/*"
      ],
      "css": [
        "/assets/css/i-global.css"
      ],
      "js": [
        "/assets/js/i-global.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "https://steamcommunity.com/*",
        "https://store.steampowered.com/*"
      ],
      "resources": [
        "/assets/*"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "16": "/assets/png/16.png",
      "32": "/assets/png/32.png",
      "48": "/assets/png/48.png",
      "128": "/assets/png/128.png"
    }
  },
  "icons": {
    "16": "/assets/png/16.png",
    "32": "/assets/png/32.png",
    "48": "/assets/png/48.png",
    "128": "/assets/png/128.png"
  }
}