Extensions are small software programs
that can modify and enhance the functionality of Google Chrome.
You write them using web technologies such as
HTML, JavaScript, and CSS.
Here are some examples of extensions:
Google Mail Checker
Uses a browser action
(icon in the toolbar)
to display how many unread messages
are in your Gmail inbox.
Click the icon to go to your inbox.
News Reader
Features a browser action that, when clicked,
shows a popup summarizing the top news items.
Subscribe in Feed Reader
Uses a page action
(icon in the address bar)
and content script
(code injected into a web page)
to let you subscribe to a feed in the current web page.