Examine source code of Half Birthday Calculator

{
  "manifest_version": 2,
  "name": "Half Birthday Calculator",
  "version": "1.0.0",
  "description": "Calculate your half birthday instantly! Find the exact date 6 months from your birthday, see the countdown, zodiac sign & more. Free & fun!",
  "author": "halfbirthdaycal.com",
  "browser_specific_settings": {
    "gecko": {
      "id": "halfbirthday@halfbirthdaycal.com",
      "strict_min_version": "79.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Half Birthday Calculator",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [],
  "homepage_url": "https://halfbirthdaycal.com/"
}