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Best Sleep Timer Alternatives
Here are some Firefox add-ons that are similar to Sleep Timer:
Bedtime Reminder
mmmm
- 0.00 
(0) Learning Time Alert
zfff
- 0.00 (0) 
TabAlert
darsi
35 0.00 (0) 
TabAlarm
Sneferu Areej
28 0.00 (0) Silent Timer
Quyen
- 0.00 (0) 
NightTimers
adijia
- 0.00 (0) 
Scheduled Alerts
Newman
- 0.00 (0) Save Electricity Timer
fvvv
- 0.00 (0) Countdown Timer v5
LukeFX
- 2.00 (1) 
DeadlineClock
nehan
28 0.00 (0)