Examine source code of Extension Source Downloader

{
  "version": "0.1.4",
  "manifest_version": 2,
  "name": "Extension Source Downloader",
  "homepage_url": "https://mybrowseraddon.com/extension-source-downloader.html",
  "description": "Download the source code for chrome extensions via toolbar popup in .zip or .crx formats.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "activeTab",
    "downloads",
    "*://clients2.google.com/service/update2/crx*",
    "*://clients2.googleusercontent.com/crx/download/*"
  ],
  "browser_action": {
    "default_popup": "data/popup/popup.html",
    "default_title": "Extension Source Downloader",
    "default_icon": {
      "16": "data/icons/16.png",
      "32": "data/icons/32.png",
      "48": "data/icons/48.png",
      "64": "data/icons/64.png"
    }
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{16915194-34b4-4aa9-b5b1-13e6ebffbe0b}"
    }
  }
}