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Best Screen Sizer Alternatives
Here are some Firefox add-ons that are similar to Screen Sizer:
Screen Sizer
Sunwin
19 0.00 
(0) 
Fire Resizer
Francesco De Stefano
55 4.17 (6) 
Breakgrid – Responsive Viewport Tester
ByteSide.io
14 0.00 (0) 
ScreenLab | Multi-Screen Preview
Lucas
6 0.00 (0) 
Resize Window Presets
Leena
1 0.00 (0) 
Responsive Design Tester Pro
Burch
14 1.00 (1) 
Custom Window Resizer
GenXJay
34 0.00 (0) 
Screen Spoofer
Screen Spoofer
8 1.00 (1) 
Quick Window Resizer
Luc
1 0.00 (0) Window Resizer HM
Billy Dixon
1 0.00 (0) 
WindowSizer
Dr. Cheap
1K 4.03 (40)