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Best Timer Addon Alternatives
Here are some Firefox add-ons that are similar to Timer Addon:
Simple Timer Addon
Yelan
1 0.00 
(0) 
The Timer
Bozidar Atanasovski
45 5.00 (1) 
Timer Extension
-- command line --
33 5.00 (1) 
Timebox Timer
Stefan
126 3.71 (7) 
Timer, Alarm & Stopwatch
Leonardo
81 2.25 (4) 
Pomodoro Timer
P0m0d0r0Guy
1 0.00 (0) 
Tracking Timer
Roy Tettero
18 5.00 (1) 
Simple Timer Popup
Aiden
1 0.00 (0) 
Time Tracker
Bolivoro
2 0.00 (0) Storm TickTock Ultimate
Korkaw
- 0.00 (0) 
Auto Reset Timer
legendarykanary
9 0.00 (0) 
Timer, Alarm & Stopwatch Pro
Thể Thao BK8
- 0.00 (0)