Related Clues:

• Surfer's entry, for short
• It often starts with 'http'
•     www bookmark
• It may start 'http://'
• Its common extensions are the theme of this puzzle
• Net address
• Address starting http://
• It starts 'http'
• Modern link, for short
• Link letters
• Online address
• Web bookmark
• Address bar entry
• Electronic address
• Dotted line?