Examine source code of Fapp Time Calculator

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Fapp Time Calculator",
  "description": "Fapp Time Calculator is a clean and simple calculator to calculate your important time, like meeting time.",
  "version": "1.0",
  "browser_action": {
    "default_icon": "icon128.png",
    "default_popup": "calculator.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{57df12b5-caf7-437e-936e-0f7a4060e8cc}"
    }
  }
}