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Best Thirteen Alternatives
Here are some Firefox add-ons that are similar to Thirteen:
Number 13
cupcakes
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Twelve of thirteen
RedSparrow
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Lucky 13
candelora
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only13
mindmin
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Hope13
HOPE13
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simple13
staszicuu
- 5.00 (1) 
Japanese 13
Bátja ⃰ ⃰ ⃰ ®
4 5.00 (1) 
The 13TH
Firefox user 12778744
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Immortal 13
marioheverton
1 0.00 (0) 
13
Antônio Diego
- 0.00 (0) 
dreizehn
Firefox user 11658758
- 0.00 (0) 
DC13
Firefox user 11539406
- 0.00 (0)