Extension for Internet Explorer 6 (or newer)
Version: 1.0.0.1
Download for Windows XP/Vista/7 . Size: 226 KByte.

Add-on for FireFox 5 (or newer)
Version: 1.1.0.2
Download from addons.mozilla.org.

Add-on for Google Chrome 18.0 (or newer)
and add-on for Yandex.Browser
Version: 1.0.0.3
Chrome Web Store.

Source code: http://code.google.com/p/social-network-tools/source/browse/.