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Best idk... Alternatives
Here are some Firefox add-ons that are similar to idk...:
Pink/Black/Gray
danod1312
- 0.00 
(0) 
acid lime
sprite
- 0.00 (0) 
Something black, white and red
CapCringe
- 0.00 (0) 
palette theme
simplyme
- 0.00 (0) 
Elemental
Geoffrey
1 5.00 (2) 
Tyrian Purple
Comrade Z
1 4.00 (1) 
simple Purple & Orange
justghebba
2 0.00 (0) 
the blue and red mix
Noobslayer69
- 5.00 (1) 
idontknow
TheIllusion24
- 0.00 (0) 
Shades of Green
Grvmvtic
- 0.00 (0) 
My theme !!
karpisnotcool
- 0.00 (0) 
Star theme intented for myself
Bub
- 0.00 (0)