Examine source code of Download GitHub Directory

{
  "name": "Download GitHub Directory",
  "description": "A Firefox add-on to use download-directory easily.",
  "version": "0.0.2resigned1",
  "manifest_version": 2,
  "icons": {
    "48": "assets/download-directory-48.png",
    "96": "assets/download-directory-96.png"
  },
  "applications": {
    "gecko": {
      "id": "download-directory-helper@gluons.github.io"
    }
  },
  "author": "Saran Tanpituckpong",
  "homepage_url": "https://github.com/gluons/download-directory-helper",
  "permissions": [
    "*://github.com/*",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "assets/download-directory.svg",
    "default_title": "Download GitHub directory"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}