Examine source code of Pinterest Downloader

{
  "manifest_version": 2,
  "name": "Pinterest Downloader",
  "description": "This extension allow you to download pinterest images",
  "version": "1.6",
  "homepage_url": "https://sites.google.com/view/pinterestdownloader/",
  "author": "Thangarajah Roshan",
  "short_name": "Pinterest Downloader",
  "browser_action": {
    "default_icon": "icons/icon_256.png"
  },
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png",
    "256": "icons/icon_256.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "toggle-feature-foo": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Command+Shift+Y"
      },
      "description": "Toggle feature foo"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{57bc827b-0b82-46a5-9a20-cde76a7903f1}"
    }
  }
}