Examine source code of Hide Chess.com Opponent

{
  "manifest_version": 2,
  "name": "Hide Chess.com Opponent",
  "version": "1.0.6",
  "description": "Finally, a fully functional focus-mode.",
  "icons": {
    "48": "assets/logo/logo-48.png",
    "64": "assets/logo/logo-64.png",
    "96": "assets/logo/logo-96.png",
    "128": "assets/logo/logo-128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "webNavigation",
    "scripting",
    "https://www.chess.com/game/*"
  ],
  "browser_action": {
    "default_icon": {
      "16": "assets/logo/logo-16.png",
      "32": "assets/logo/logo-32.png"
    },
    "default_title": "Chess.com Settings",
    "default_popup": "user/popup.html",
    "browser_style": true
  },
  "options_ui": {
    "page": "user/options.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "background/storage.js",
      "background/listeners.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hidechesscomopponent@maxdev.dev",
      "strict_min_version": "102.0"
    }
  }
}