Related Clues:

• URL ending
• E-mail suffix
• Dot follower [with 38-Across + 35-Down, this puzzle's theme]
• Dot-___
• Dot follower, often
• Internet address ender
• Amazon extension?
• Net alternative
• URL tag
• Internet address ending, typically
• U.R.L. ender
• Web-address piece
• Dot follower, perhaps
• Dimes, in a way
• URL suffix