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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
17 1.00 
(1) 
Responsive Mobile Simulator
MobileReady
7 0.00 (0) 
mobile-simulator-tool
Lautaro Carnevale
12 0.00 (0) 
Screen Sizer
Connor Nee
35 0.00 (0) 
Mobile Simulator Extension MSIM: Responsive Viewer
Mobile Simulator (MSIM)
2 5.00 (1) 
ScreenLab | Multi-Screen Preview
Lucas
9 0.00 (0) 
Fire Resizer
Francesco De Stefano
56 4.17 (6) 
Mobile simulator - responsive testing tool
François
11K 3.76 (62) 
Bezel — Responsive Tester & Device Emulator
Alexander Hagenah
1 5.00 (1) 
Screen Spoofer
Screen Spoofer
10 1.00 (1) 
Breakgrid – Responsive Viewport Tester
ByteSide.io
20 0.00 (0) Mobile Screen Simulator
Win55
121 1.00 (1)