Plugin Title: LinkPreview
"LinkPreview is an AOL AIM6 plugin that lets you preview a link. Your friend send link to you, and you are too busy to open it in new window, or you want to check what you will see if you will click, then this plugin for you. It shows you a small image of webpage that your friend sent to you. If you want to change size of image go to plugin settings."
You can download the plug-in here.
And get full instructions here.