Examine source code of Pixel Chess Pieces

{
  "manifest_version": 2,
  "name": "Pixel Chess Pieces",
  "version": "1.0",
  "description": "Changes Chess.com's pieces to custom pixel ones. Pieces made by Skemonde, Extension by Biurza",
  "icons": {
    "48": "pieces/icon48.png",
    "96": "pieces/icon96.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.chess.com/*"
      ],
      "js": [
        "custom_pieces.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "pieces/icon48.png"
    }
  },
  "web_accessible_resources": [
    "pieces/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0fd0f1d7-62f9-4534-9024-b2e59b7487c9}"
    }
  }
}