Examine source code of Host Grabber ++

{
  "manifest_version": 2,
  "name": "Host Grabber ++",
  "description": "__MSG_extensionDescription__",
  "version": "0.12",
  "author": "Rhadamanthe",
  "homepage_url": "https://rhadamanthe.github.io/host-grabber-pp",
  "default_locale": "en",
  "icons": {
    "48": "icons/logo_x48.png"
  },
  "applications": {
    "gecko": {
      "id": "{1a70f086-e7b8-43da-8171-e3e5c532ad4f}",
      "strict_min_version": "58.0"
    }
  },
  "options_ui": {
    "page": "src/html/options.html",
    "browser_style": true,
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "src/scripts/npm/browser-polyfill.min.0.3.1.js",
      "src/scripts/background/library.utilities.js",
      "src/scripts/background/library.strategies.js",
      "src/scripts/background/library.processors.js",
      "src/scripts/background/library.queue.js",
      "src/scripts/mixed/commons.js",
      "src/scripts/mixed/library.commons.js",
      "src/scripts/mixed/library.dictionary.js",
      "src/scripts/background/dl-manager.js",
      "src/scripts/background/background.hg.js",
      "src/scripts/background/background.debug.hg.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/scripts/npm/browser-polyfill.min.0.3.1.js",
        "src/scripts/content/content.hg.js"
      ]
    }
  ],
  "commands": {
    "dl": {
      "suggested_key": {
        "default": "Ctrl+Shift+Down"
      },
      "description": "Download media files from the current page"
    }
  },
  "sidebar_action": {
    "default_title": "Debug - IHG ++",
    "default_panel": "src/html/debug.html",
    "default_icon": "icons/logo_x48.png"
  },
  "permissions": [
    "contextMenus",
    "tabs",
    "storage",
    "downloads",
    "downloads.open",
    "<all_urls>"
  ]
}