Examine source code of Chess.com Blocker

{
  "manifest_version": 2,
  "name": "Chess.com Blocker",
  "version": "2.1.0.7",
  "description": "Prevent binging on chess.com. Blocks chess.com if you lose too many games.",
  "permissions": [
    "storage",
    "tabs",
    "https://api.chess.com/*",
    "https://*.chess.com/game*",
    "https://*.chess.com/play/online*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.chess.com/game*",
        "https://*.chess.com/play/online*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "knook.png",
    "default_popup": "options.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "identifier@chessblockerextension.com"
    }
  }
}