Examine source code of Chess.com Hide Data

{
  "manifest_version": 2,
  "name": "Chess.com Hide Data",
  "version": "1.1",
  "description": "Hide elements from chess.com game page - ratings and captured pieces",
  "author": "Fabio Barbosa",
  "homepage_url": "https://github.com/fabiobarbosa/chesscom-hide-data",
  "permissions": [
    "activeTab",
    "https://www.chess.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.chess.com/play*, https://www.chess.com/game*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "chesscom-hidedata@github.com",
      "strict_min_version": "58.0"
    }
  }
}