Examine source code of Clickty Clacks

{
  "manifest_version": 2,
  "name": "Clickty Clacks",
  "version": "1.0",
  "description": "An extension that lets you play sounds while typing",
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon.png",
      "48": "icons/icon.png",
      "128": "icons/icon.png"
    }
  },
  "icons": {
    "16": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "src/main-window.html",
    "sounds/default-sound.wav"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f6e4959a-d96d-4957-b54e-2881ca3049e0}"
    }
  }
}