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Best Spectrum Alternatives
Here are some Firefox add-ons that are similar to Spectrum:
Pink Spectrum Firefox
Rolando Rivas
- 3.50 
(2) 
SpectraSync
85Win
- 0.00 (0) Better UI
Enigma Labs Inc
1 0.00 (0) 
Spectrum Swapper
Lucas Ciprian
- 0.00 (0) 
Custom Dark Mode
Loori
74 3.87 (15) 
Dark Mode (WebExtension)
Bernard
48K 4.17 (767) 
Fasty flavortown extension
Yovo
1 0.00 (0) 
Darkify
Gabriel
10 5.00 (3) 
Better dark mode
TromoSM
7 0.00 (0) 
MSGDRK
wojexe
3 0.00 (0) 
Messenger Dark Theme
Headary
6K 4.60 (70) 
Enhancer for Classroom™
saikat0511
112 3.00 (1)