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Best Spectrum Alternatives
Here are some Firefox add-ons that are similar to Spectrum:
SpectraSync
85Win
- 0.00 
(0) Better UI
Enigma Labs Inc
3 0.00 (0) 
Dark Mode (WebExtension)
Bernard
44K 4.17 (767) 
Custom Dark Mode
Loori
79 3.87 (15) 
Fasty flavortown extension
Yovo
1 0.00 (0) 
Darkify
Gabriel
12 5.00 (3) 
Better dark mode
TromoSM
6 0.00 (0) 
MSGDRK
wojexe
3 0.00 (0) 
Messenger Dark Theme
Headary
6K 4.60 (70) 
Enhancer for Classroom™
saikat0511
89 3.00 (1) 
Spectrum Buddy
MUHAMMAD IKHMAL HAKIMIE BIN SAIFOL BAHRI
1 5.00 (1) 
Dark Mode for Outlook
jerboa88
20 2.67 (3)