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Best Screen Flex Alternatives
Here are some Firefox add-ons that are similar to Screen Flex:
Responsive Design Tester Pro
Burch
14 1.00 
(1) 
mobile-simulator-tool
Lautaro Carnevale
8 0.00 (0) 
Screen Sizer
Connor Nee
18 0.00 (0) 
ScreenLab | Multi-Screen Preview
Lucas
6 0.00 (0) 
Fire Resizer
Francesco De Stefano
54 4.17 (6) 
Screen Spoofer
Screen Spoofer
9 1.00 (1) 
Breakgrid – Responsive Viewport Tester
ByteSide.io
15 0.00 (0) 
Mobile Screen Simulator
Win55
138 1.00 (1) 
Lumina Device Simulator Pro
Mochi Studio
20 0.00 (0) Screen Sizer
Sunwin
19 0.00 (0) Mobile Screen Viewer
Mocbai
3 0.00 (0) 
ScreenSimulate
BK8 Supply
- 0.00 (0)