Rated 5 out of 5 stars

Easy DragToGo+
https://addons.mozilla.org/zh-CN/firefox/addon/easy-dragtogo-1/

------------------------------------------------------------------------------------
http://www.firefox.net.cn/forum/viewtopic.php?t=29894
new one can be used @ firefox 5.0

This user has 2 previous reviews of this add-on.