LightSMS For Mac Publisher's description
from Byungwook Kang
A Firefox add-on that allows you to send free SMS
You need an account of NateOn messenger(www.nate.com) or www.tworld.co.kr.
The LightSMS extension works only in case you are a customer of SK Telecom, KTF or LG Telecom.
What's New in This Release:В· Fixed login
System Requirements:В· Firefox 1.5 to 4.0.*
Program Release Status: Minor Update
Program Install Support: Install and Uninstall