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Best Otto Alternatives
Here are some Firefox add-ons that are similar to Otto:
Otto (unofficial)
LivingUserError
1 0.00 
(0) 
otto-kde-slate-blue
MisterBenn
- 5.00 (1) 
Box Otto's Personal Theme
Box Otto
- 0.00 (0) 
Qt (Materia Dark KDE) - Orange
morganist
1 0.00 (0) 
sv-kde-dark
SV
- 0.00 (0) 
otto-orange
randomness
1 4.00 (1) 
KDE Dark 69
santi
- 0.00 (0) 
Monochrome - KDE
murilouco
9 0.00 (0) 
Moe
devboi99
1 5.00 (2) 
Kubuntu-KDE4
-kele-
1 5.00 (2) 
Ambient-Blue 2
devboi99
- 0.00 (0) 
KDE Classic Oxygen (Dark)
Michael
1 3.00 (1)