Examine source code of Copy-Paste Sounds

{
  "manifest_version": 2,
  "name": "Copy-Paste Sounds",
  "version": "1.0",
  "description": "Phát âm thanh khi copy (click) và paste (swish).",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "Copy-Paste Sounds",
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e4ced0e-8963-44f8-a9a6-5e111f533a8b}"
    }
  }
}