Examine source code of Offline Web Saver

{
  "manifest_version": 2,
  "name": "Alltube Download",
  "description": "Easily download videos from Youtube, Dailymotion, Vimeo and other websites.",
  "version": "0.4.4",
  "author": "Pierre Rudloff",
  "homepage_url": "https://alltubedownload.net/",
  "options_ui": {
    "page": "data/options.html"
  },
  "icons": {
    "32": "data/favicon.png",
    "60": "data/logo_60.png"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "32": "data/favicon.png",
      "60": "data/logo_60.png"
    },
    "default_title": "AllTube"
  },
  "background": {
    "scripts": [
      "lib/main.js"
    ]
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "storage"
  ],
  "commands": {
    "download": {
      "suggested_key": {
        "default": "Ctrl+Shift+D"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b2df2358-0233-49f6-9d88-0612a1042c43}"
    }
  }
}