Examine source code of epoch-time-converter

{
  "manifest_version": 2,
  "name": "epoch-time-converter",
  "version": "1.1.0",
  "description": "Easily convert time stamps form epoch to ISO 8601 format. Supports input in seconds, milliseconds and nanoseconds.",
  "homepage_url": "https://github.com/zodiac403/epoch-time-converter",
  "author": "zodiac403 <zodiac403@gmx.de>",
  "browser_action": {
    "default_title": "Epoch time converter",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "32": "icon/icon-32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{19fde727-ea2a-4ee5-b326-0bdc287c7de9}"
    }
  }
}