Examine source code of Humble Bundle Downloader

{
  "version": "1.5.2",
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "permissions": [
    "*://*.humblebundle.com/*",
    "activeTab",
    "downloads",
    "notifications",
    "storage"
  ],
  "icons": {
    "16": "icons/HBMD_logo_16.png",
    "48": "icons/HBMD_logo_48.png",
    "96": "icons/HBMD_logo_96.png",
    "128": "icons/HBMD_logo_128.png"
  },
  "page_action": {
    "default_icon": "icons/HBMD_logo_16.png",
    "show_matches": [
      "https://*.humblebundle.com/*"
    ],
    "browser_style": true,
    "default_title": "__MSG_extensionName__",
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "./static/js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.humblebundle.com/downloads*"
      ],
      "js": [
        "./static/js/content-script-loaded.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icons/HBMD_logo_16.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{01898eb5-c692-4100-9421-cabdbd7a038e}"
    }
  }
}