BuzzGrowl if a Firefox addon, allows you to see what others are saying about any website that you re browsing.
Features:
1. Get the hottest news, and shopping coupons in real-time as you surf
2. Tweet, retweet or share to Facebook with 1-click
3. Toggle on and off by clicking the orange logo

The license of this software is Freeware, you can free download and free use this browser plug-ins software.