Skype Firefox Exention Changes Phone Numbers into Buttons
Update: For steps on removing the Skype-Firefox extension, see this post from howtogeek.com.
Skype 3.0 has just been released. An interesting feature is the Skype extension for Firefox. When you browse a website and see a phone number on the site, the Skype extension automatically converts it into a button that you click to call the person using Skype. Unfortunately, with Skype 3.0, calls to cell and home phones now cost money.
Here's a picture of the button: