Examine source code of Scratch Downloader

{
  "name": "Scratch Downloader",
  "author": "TheUltimateGuide",
  "version": "1.0.4",
  "manifest_version": 2,
  "description": "A Chromium/Firefox Extension to download files from Scratch",
  "icons": {
    "16": "/icons/scratchdownload16x16.png",
    "32": "/icons/scratchdownload32x32.png",
    "48": "/icons/scratchdownload48x48.png",
    "128": "/icons/scratchdownload128x128.png"
  },
  "browser_action": {
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e4db3961-104d-49ce-bbce-f9212c1832a9}"
    }
  }
}