Examine source code of Quick Punch

{
  "manifest_version": 3,
  "name": "Quick Punch",
  "version": "1.0.1",
  "description": "Quick Punch buttons for PunchIt web app.",
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://punchit.atomicobject.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "laura.bucchieri@atomicobject.com"
    }
  },
  "icons": {
    "16": "icons/favicon-16x16.png",
    "32": "icons/favicon-32x32.png",
    "48": "icons/favicon-48x48.png",
    "96": "icons/favicon-96x96.png"
  }
}