yoo

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Across
  1. 4. message (4 letters): CHAT
  2. 5. threat (7 letters): MALWARE
  3. 7. snippet (4 letters): APPS
  4. 9. unit (4 letters): BYTE
  5. 10. tracking file (6 letters): COOKIE
Down
  1. 1. security feature (8 letters): FIREWALL
  2. 2. picture (3 letters): JPG
  3. 3. troublemaker (5 letters): TROLL
  4. 6. port (3 letters): usb
  5. 8. address (3 letters): URL