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Best Black Sides Alternatives
Here are some Firefox add-ons that are similar to Black Sides:
Custom Borders for Websites
XIN88
- 0.00 
(0) 
Top and Bottom scroll buttons
Dm3
928 4.38 (78) 
White to Black
BitVortexLab
113 2.00 (1) 
disinterest
Sami Jokela
- 0.00 (0) 
Adaptive Darkmode
Ninety Nine for One
614 5.00 (2) 
Black Blue and white SDXA SAW
Bartosz
- 0.00 (0) 
TestBorderify
Trybestbestr
- 0.00 (0) 
Dark Mode Website Switcher
rugk
1K 4.04 (25) 
Darker Background Brighter Font
zero0evolution
57 4.42 (12) 
Fullscreen Plus
Trishul
1K 3.49 (68) 
Hide Scrollbar
duyxyz
14 0.00 (0) 
Dark New Tab
Milen
767 3.87 (23)