Examine source code of HTTP Downloader

{
  "default_locale": "en",
  "description": "__MSG_extension_description__",
  "manifest_version": 2,
  "name": "HTTP Downloader",
  "version": "1.0.2.9",
  "homepage_url": "https://erickutcher.github.io/#HTTP_Downloader",
  "applications": {
    "gecko": {
      "id": "{72A03DE1-BE2A-4311-8D60-48035585E4E0}",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "64": "icons/icon-d-64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://erickutcher.github.io/noop/"
      ],
      "js": [
        "download.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_action": {
    "default_icon": "icons/icon-d-64.png",
    "default_title": "HTTP Downloader",
    "default_popup": "options.html"
  },
  "commands": {
    "override_download_manager": {
      "suggested_key": {
        "default": "Alt+O"
      },
      "description": "Toggle the overriding of the browser's download manager."
    },
    "add_urls_window": {
      "suggested_key": {
        "default": "Alt+U"
      },
      "description": "Open an Add URL(s) window."
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "webRequest",
    "contextMenus",
    "cookies",
    "storage",
    "downloads"
  ]
}