Yesterday, I shared a neat Chrome extension called WikiTube. WikiTube matches YouTube videos to Wikipedia entries. This morning I had a couple of emails from people asking how to add that extension to their browsers. Rather than trying to type the directions, I created the screencast video and annotated screenshots that you can see below. (Click the screenshots to view them in full size). One thing that I left out of the directions is that you should sign into your account before adding the extensions.