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Best FocusFlash Alternatives
Here are some Firefox add-ons that are similar to FocusFlash:
Flash Study
Kendrick Mann
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FlashQuiz Reflex Trainer
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critical thinking
Firefox user 10499642
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flash-01
bitgen
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Fortune Focus
sheilovealways
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Pause, Reflect
Pause, Reflect
7 0.00 (0) 
A Flash of Light
nature_way
2 0.00 (0)