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Best plexiglass Alternatives
Here are some Firefox add-ons that are similar to plexiglass:
Screen Curtain
Deafinitive
3 0.00 
(0) 
Disable Page Visibility API
Marvin Schopf
331 4.22 (9) 
Focus Overlay
NLnhchekpu11
- 0.00 (0) 
blindify
wopolow
15 3.00 (2) 
Focus mocus
Kaustubh Walokar
1 5.00 (1) 
Reading Aid
Telmo Carvalho
215 4.00 (3) 
Page Dark
Marnes
24 4.38 (8) 
Accessibility Persona Lens
Orange Halo
3 0.00 (0) Clear Glass (Chrome Fork)
Memeronii
194 5.00 (6) Disable Page Visibility API
Frank Dreßler
7K 4.71 (45) 
Privacy Window
MrQvist
1 0.00 (0) 
Cognitive Comfort
Oleg Pulatov
- 0.00 (0)