Examine source code of Hide My Email+

{
  "manifest_version": 3,
  "name": "Hide My Email+",
  "description": "Use iCloud's Hide My Email service in your browser with Hide My Email+.",
  "version": "1.4.9",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon-32.png",
    "default_title": "Hide My Email+"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "options_page": "options.html",
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "icloud_com_simulation_headers",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "permissions": [
    "declarativeNetRequest",
    "storage",
    "tabs",
    "contextMenus",
    "webRequest",
    "notifications"
  ],
  "host_permissions": [
    "https://*.icloud.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3b720a0-8bf9-4e1f-b0e2-1e97f6ff708b}",
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "options_ui": {
    "open_in_tab": false,
    "page": "options.html"
  }
}