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Best NightPDF Alternatives
Here are some Firefox add-ons that are similar to NightPDF:
PDF Dark Mode Reader
Neel Sorathiya
347 4.00 
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Invert Any Web
Kaveen Amarasekara
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Peter Nerlich
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30 4.36 (14) 
Simple Dark Mode Toggle
IT-Service Frankfurt
8 5.00 (2) Dark Mode Invert Colors
G.G.Ashbrook
66 5.00 (2) Color Inverter
VN88 Capital
127 5.00 (4) Dark Mode
EAR
33 0.00 (0) 
PDF Inverter - Night Mode (Deprecated)
Jay Mistry
76 1.25 (32) 
Dark Mode Global
Joue
32 3.80 (10) 
Night Shift
Sevyn Ramirez
29 0.00 (0) 
Invert Image color
vycb
137 4.33 (6)