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Best Onyx Alternatives
Here are some Firefox add-ons that are similar to Onyx:
Onyx Theme
Macify
6 5.00 
(3) 
Blue Dark
Kaustubh
4 5.00 (3) 
Darky
Anomynous
- 0.00 (0) 
Dark Gray Custom
Nine
1 0.00 (0) 
Darked
Unnat Shaneshwar
- 5.00 (1) 
One Dark
emanuelep57
19 5.00 (2) 
Mattblack (Dark)
omfj
- 0.00 (0) 
Grey Dark
hocasiones
4 0.00 (0) 
Obsidian Orange
mirdaki
1 4.00 (1) 
CB Black theme
art of chance
- 0.00 (0) 
RubyDark
Amine Neggazi
- 0.00 (0) 
Dark Green Custom
Matt Gore
2 0.00 (0)