Examine source code of EmailShield

{
  "manifest_version": 3,
  "name": "EmailShield",
  "version": "1.1",
  "description": "1-Click Phishing Protection for Gmail",
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@emailshield.com",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "48": "icons/icon48.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "scripting",
    "contextMenus",
    "notifications",
    "alarms"
  ],
  "host_permissions": [
    "webRequest",
    "https://mail.google.com/*",
    "https://outlook.live.com/*",
    "https://outlook.office365.com/*",
    "https://mail.yahoo.com/*",
    "https://emailshield.com/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "report.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon48.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "https://outlook.live.com/*"
      ],
      "css": [
        "content/content.css"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ]
}