Examine source code of xorkeesign Webmail

{
  "name": "xorkeesign Webmail",
  "description": "Digitally sign and verify emails in popular web mail services.",
  "version": "2.13.1",
  "manifest_version": 3,
  "permissions": [
    "scripting",
    "storage",
    "tabs",
    "downloads"
  ],
  "host_permissions": [
    "https://www.odysseytec.com/*",
    "https://xorkeesign.com/*",
    "https://profile.xorkee.com/*"
  ],
  "optional_host_permissions": [
    "https://ap1.myprofessionalmail.com/*",
    "https://odysseytec.co.in/*",
    "https://outlook.live.com/*",
    "https://outlook.office.com/*",
    "https://outlook.office365.com/*",
    "https://outlook.cloud.microsoft/*",
    "https://attachment.outlook.live.net/*",
    "https://attachments.office.net/*",
    "https://mail.google.com/*",
    "https://mail-attachment.googleusercontent.com/*",
    "https://mail.zoho.in/*",
    "https://mail.zoho.com/*",
    "https://workplace.zoho.in/*",
    "https://workplace.zoho.com/*",
    "https://pop.odysseytec.com/*",
    "https://mail.zimbra.com/*",
    "https://clocktix.com/*",
    "https://future.zimbra.tech/*",
    "https://mail.odysseytec.com/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "*"
      ],
      "matches": [
        "https://ap1.myprofessionalmail.com/*",
        "https://odysseytec.co.in/*",
        "https://outlook.live.com/*",
        "https://outlook.office.com/*",
        "https://outlook.office365.com/*",
        "https://outlook.cloud.microsoft/*",
        "https://mail.google.com/*",
        "https://mail.zoho.in/*",
        "https://mail.zoho.com/*",
        "https://workplace.zoho.in/*",
        "https://workplace.zoho.com/*",
        "https://pop.odysseytec.com/*",
        "https://mail.zimbra.com/*",
        "https://clocktix.com/*",
        "https://future.zimbra.tech/*",
        "https://mail.odysseytec.com/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'none';"
  },
  "action": {
    "default_popup": "background/unsupported.html"
  },
  "icons": {
    "16": "images/logo16.png",
    "32": "images/logo32.png",
    "48": "images/logo48.png",
    "128": "images/logo128.png"
  },
  "background": {
    "scripts": [
      "library/defines.js",
      "common/bgdefines.js",
      "library/XSMAIL.js",
      "library/webmail.js",
      "common/msghandler.js",
      "library/connectxs.js",
      "background/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "xorkeesignWebmail@odysseytec.com",
      "strict_min_version": "109.0"
    }
  }
}