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Best SpectraSync Alternatives
Here are some Firefox add-ons that are similar to SpectraSync:
Ambient Theme by Site Colour
Manikandan D
99 5.00 
(8) 
ColorShift
DPende
1 5.00 (1) 
Quick Link Highlighter
KJC
1 0.00 (0) 
StyleShift
weeiwrsa
1 0.00 (0) Page Color Changer
Soft Rank Links
3 0.00 (0) 
Spectrum of Colors
jclarss
- 0.00 (0) 
Toggle dark mode
Cimbali
984 4.29 (28) 
Dark Mode Toggle
marga
- 0.00 (0) Page Highlighter Lite
54bet
1 0.00 (0) 
Colorful Tab Highlighter
frederick
8 1.00 (2) 
CHANGE: Customize Webpage Colors
CGX
6 0.00 (0) 
Firelux
ValentinG_
1K 4.80 (20)