Grepolis Attack Sound Alarm – Script
22.06.2013

Plays a sound if you get attacked and displays a toggle button to mute/unmute the alarm sound. Tested in latest Google Chrome and Mozilla Firefox.
For use with Tampermonkey/Greasemonkey
Tampermonkey: https://chrome.google.com/webstore/
Greasemonkey: https://addons.mozilla.org/pt-pt/firefox/addon/greasemonkey/
Script: http://userscripts.org/scripts/show/162017