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Best Num Trivia Alternatives
Here are some Firefox add-ons that are similar to Num Trivia:
Number Info
Þórdís Maxima
5 0.00 
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Number Facts
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26 0.00 (0) 
Num Facts
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5 0.00 (0) 
Prime Numbers
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1 0.00 (0) 
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abominablepug
1 0.00 (0) 
Prime Checker
abofyx
26 0.00 (0) 
Prime Number Finder Basic
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- 0.00 (0) 
Prime Number Checker
Nhà Cái Đẳng Cấp
- 0.00 (0) Math Quick Quiz
Garrick Ironfist
- 0.00 (0) 
2048 Prime
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22 5.00 (2) 
Math Math Math
Thara87
1 3.75 (4) Daily Fun Facts
Audrey Bennett
- 0.00 (0)