Examine source code of Nepali-Calendar

{
  "manifest_version": 3,
  "name": "Nepali-Calendar",
  "version": "1.0",
  "description": "A pocket extension for displaying Nepali calendar and time.",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "nepalicalender@example.org"
    }
  }
}