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Best Chrono Alternatives
Here are some Firefox add-ons that are similar to Chrono:
Cronox
UlisesFco
22 0.00 
(0) 
Prime Clock Snap I60I
Nabil
- 0.00 (0) Thunder Countdown Flow
Mathieu
- 0.00 (0) Zen Reminder
Charles
1 0.00 (0) Orange Clockwork - Alarme
Lucas de Souza
- 0.00 (0) 
Timer (alarm, timer and stopwatch)
Karl
5K 4.17 (102) Mini Bright TickTock
garcia
- 0.00 (0) 
Auto Alarm
xxthunder
1 0.00 (0)