Chess.com Custom Pieces & GIF Background

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Chess.com Custom Pieces & GIF Background",
  "description": "Customize your chess board on Chess.com with your own images and even animated GIFs! Import new ones or share yours with others.",
  "version": "0.3.2",
  "content_security_policy": {
    "extension_pages": "script-src 'self' ; object-src 'self'"
  },
  "icons": {
    "128": "icon.png"
  },
  "background": {
    "service_worker": "background.js"
  },
  "action": {
    "default_title": "Chess.com Custom Pieces",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "scripting",
    "downloads",
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.chess.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}