Examine source code of ChessRun

{
  "manifest_version": 2,
  "name": "ChessRun",
  "version": "1.0",
  "description": "A tool to help speed runnning chess",
  "icons": {
    "48": "icons/main.svg"
  },
  "applications": {
    "gecko": {
      "id": "chessrun@etopiei.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "browser-polyfill.js",
        "lichess.js",
        "chess.com.js",
        "chessrun.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/main.svg",
    "default_title": "ChessRun",
    "default_popup": "popup/ui.html"
  },
  "web_accessible_resources": [
    "popup/browser-polyfill.js",
    "popup/main.js"
  ]
}