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Best Simple Alternatives
Here are some Firefox add-ons that are similar to Simple:
Simple
demosthenes
1 5.00 
(1) 
Simple-Brown
Firefox user 6968530
- 0.00 (0) 
DarkFox Simple
Useful Programmer
- 5.00 (1) 
Simple Best
Theme Makers
- 0.00 (0) 
Simplee Greey
rahartt
- 0.00 (0) 
https://addons.mozilla.org/en-US/firefox/themes/fi
HollandB
1 2.86 (7) 
Simplicity24
JaydenDev
- 0.00 (0) 
Simple and Minimal // Grey
iCELaGlacE
3 0.00 (0) 
SimplyDark
Rushi Vachhani
1 0.00 (0) 
Simple blue theme for firefox
Roberto Gigli
1 0.00 (0) 
Blue Simple
Tom
88 4.57 (7) 
Simple Fox Theme
Useful Programmer
- 5.00 (1)