Examine source code of InboxAudit

{
  "manifest_version": 3,
  "name": "InboxAudit",
  "version": "2.0.0",
  "description": "Forensic Email Scanner",
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://mail.google.com/*",
    "https://mail.proton.me/*",
    "https://outlook.live.com/*",
    "https://outlook.office.com/*",
    "https://outlook.office365.com/*",
    "https://mail.yahoo.com/*",
    "https://mail.aol.com/*",
    "https://*.gmx.com/*",
    "https://*.gmx.net/*",
    "https://*.run.app/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "support@inboxaudit.app",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "https://mail.proton.me/*",
        "https://outlook.live.com/*",
        "https://outlook.office.com/*",
        "https://outlook.office365.com/*",
        "https://mail.yahoo.com/*",
        "https://mail.aol.com/*",
        "https://*.gmx.com/*",
        "https://*.gmx.net/*",
        "https://*.run.app/*",
        "https://inboxaudit.app/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "all_frames": false,
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}