At present it can be used only firefox and google chrome only. So i hope from now you will not looking for clumsy emoticons code for facebook chat.
Chat With Your Facebook Friends Using Auto EmoticonsHere's how to do it on firefox :
First of you need to install Greasemonkey add ons on your browser from this link.
Now go to this link
Install button click
Now you are done.
Go to facebook.com sign in with your id and password and start chat with your facebook friends like this below picture:
Have fun with facebook emoticons.