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Best Sidebar Timer Alternatives
Here are some Firefox add-ons that are similar to Sidebar Timer:
Sidebar Timer & Stopwatch
Incognito
8 0.00 
(0) 
Time Tracker
klaetke
3 1.00 (1) 
Speak Timer
Roy Tettero
1 0.00 (0) 
Speech Timer
Дмитрий Бравиков
1 0.00 (0) 
QuickTimer
Lukareto
1 0.00 (0) 
HappyTimer - Time your tasks simple and effective
Julian von Gebhardi
- 5.00 (1) 
Interval Training Timer
123Win
1 0.00 (0) Task Timer v4
789BET
- 0.00 (0) 
Tab Timer
walter
27 0.00 (0) Tiny Timer
Kaecy
4 0.00 (0)