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Best Screen Info Alternatives
Here are some Firefox add-ons that are similar to Screen Info:
Viewport Inspector
Anna Balashova
30 0.00 
(0) 
Screen Resolution Info
Anna Balashova
29 0.00 (0) 
Display Info
Anna Balashova
28 0.00 (0) 
Window Size Helper
Azamat Ciobeer
26 0.00 (0) 
Screen Sizer
Connor Nee
18 0.00 (0) 
Viewport DPR Info
Azamat Ciobeer
26 0.00 (0) 
Viewport Master - Responsive
NOHU90
- 0.00 (0) 
ScreenLab | Multi-Screen Preview
Lucas
6 0.00 (0) 
Viewport Resizer Plus
Bongvip
35 0.00 (0)