Examine source code of Jamku Portal

{
  "manifest_version": 3,
  "name": "Jamku Portal",
  "version": "1.5.0",
  "description": "Companion to Jamku Portal Software (portal.jamku.app). It automates process of login into indian tax department websites.",
  "short_name": "Jamku Portal",
  "author": "jamku.support@madrecha.com",
  "minimum_chrome_version": "101",
  "icons": {
    "16": "img/jamku_128.png",
    "48": "img/jamku_128.png",
    "128": "img/jamku_128.png",
    "512": "img/jamku_512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "portal@jamku.app"
    }
  },
  "permissions": [],
  "options_page": "popup/options.html",
  "action": {
    "default_popup": "popup/main.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://jamku.app/*"
      ],
      "js": [
        "content-script/import-utils.js"
      ],
      "css": [
        "content-script/jamku.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://eportal.incometax.gov.in/iec/foservices/*"
      ],
      "js": [
        "content-script/import-it.js"
      ],
      "css": [
        "content-script/it.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://services.gst.gov.in/services/login/*"
      ],
      "js": [
        "content-script/import-gst.js"
      ],
      "css": [
        "content-script/gst.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://www.tdscpc.gov.in/app/login.xhtml"
      ],
      "js": [
        "content-script/import-traces.js"
      ],
      "css": [
        "content-script/traces.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "chunks/*-*.js",
        "content-script/utils.js",
        "content-script/it.js",
        "content-script/gst.js",
        "content-script/traces.js"
      ],
      "matches": [
        "https://jamku.app/*",
        "https://eportal.incometax.gov.in/*",
        "https://services.gst.gov.in/*",
        "https://www.tdscpc.gov.in/*"
      ]
    }
  ]
}