Examine source code of Timezonify

{
  "manifest_version": 2,
  "name": "Timezonify",
  "version": "5.3",
  "description": "Makes all timings local. Save the hassle of googling the time using Timezonify's build-in conversion feature.",
  "icons": {
    "128": "icons/timezonify-logo-128.png"
  },
  "permissions": [],
  "background": {
    "scripts": [
      "browser-polyfill.js"
    ],
    "page": "background/background.html"
  },
  "browser_action": {
    "default_icon": "icons/timezonify-logo-128.png",
    "default_title": "Timezonify",
    "default_popup": "popup/timezonify-config.html"
  },
  "web_accessible_resources": [
    "utils/utils.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0da06f4-9f95-41f1-9e42-eb189dc8c758}"
    }
  }
}