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Best Core Alternatives
Here are some Firefox add-ons that are similar to Core:
Blocks
000
- 5.00 
(1) 
Simple abstract theme
Firefox user 12409804
- 0.00 (0) 
Modern Clean Dark
Tito
1 5.00 (2) 
Blue Circles
dewanta
- 0.00 (0) 
Blue abstract theme
Трулялюшки
- 0.00 (0) 
Pink Abstract Theme
Mirian Sousa
- 0.00 (0) 
So Cute Abstract Theme
Mirian Sousa
- 0.00 (0) 
SimplyDark-
Meyetehee
- 0.00 (0) 
Minimalist dark
Matej
- 0.00 (0) 
Creative Dark Red
Fable
- 0.00 (0) 
Simple Dark Blue Theme
Gadzooks
20 4.82 (11) 
Modern Blue
000
- 0.00 (0)