I believe this is the toolbar add-on that you are referencing: http://www.ant.com/video-downloader/

They have versions available for both IE and FireFox.

Enjoy!

From: Mark Weston <mark.weston5@ntlworld.com>
To: KLF@mailman.xmission.com
Sent: Sat, January 16, 2010 11:11:07 AM
Subject: [KLF] off topic re downloading from you tube

Hi someone posted a few weeks ago about a toolbar type add on prog to download clips from you tube.

I lost the link can someone re post it please.

Thanks

Regards Mark W.