Examine source code of Page Translator Revised

{
  "manifest_version": 2,
  "name": "Page Translator Revised",
  "version": "2019.5.23",
  "developer": {
    "name": "Mathnerd314",
    "url": "https://github.com/Mathnerd314/page-translator"
  },
  "description": "Translate any page using Google Translate or Microsoft Translator.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "menus"
  ],
  "page_action": {
    "browser_style": true,
    "default_icon": "icons/icon.svg",
    "default_title": "Translate Page"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "page-translator-revised@mathnerd314.github.com"
    }
  }
}