Examine source code of Unix Converter

{
  "name": "Unix Converter",
  "short_name": "Unix Convert",
  "description": "An easy-to-use all-in-one Unix Epoch timestamp converter.",
  "author": "Isaac Oram",
  "version": "1.2.2",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "contextMenus",
    "tabs",
    "clipboardWrite",
    "http://*/",
    "https://*/"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "dayjs.js",
        "browser-polyfill.min.js",
        "convert.js",
        "content.js"
      ],
      "css": [
        "main.css"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "dayjs.js",
      "convert.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Unix Converter"
  },
  "web_accessible_resources": [
    "timezones.json"
  ],
  "icons": {
    "16": "images/logo16.png",
    "48": "images/logo48.png",
    "96": "images/logo96.png",
    "128": "images/logo128.png"
  },
  "commands": {
    "cycle-fetch-format": {
      "suggested_key": {
        "default": "Alt+Shift+0"
      },
      "description": "Cycles the fetch format setting."
    }
  }
}