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Best GrayMode Alternatives
Here are some Firefox add-ons that are similar to GrayMode:
Monochromate - The Best Greyscale Extension
lirena00
465 4.78 
(9) 
Reduce Eye Strains - Grayscale Filter
Nubet
20 0.00 (0) 
Grayscale Websites
UserFile.org
2 0.00 (0) 
Grayscale Toggle
bwangc
3 0.00 (0) 
Boring YouTube
Morgan Koh
22 0.00 (0) 
Undistract
Helios
22 5.00 (1) 
Social Media Detoxer
Mathis
1 0.00 (0) 
Facebook To Gray
Guillaume M
2 4.00 (1) 
ColorRevive
Tong
1 0.00 (0) GrayscaleToggle
lagina
1 0.00 (0) No distractions
hqq3rr93
1 0.00 (0) 
Monk Mode - Website Blocker
Leonardo
1 0.00 (0)