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Best showWindowSize Alternatives
Here are some Firefox add-ons that are similar to showWindowSize:
Display Window Size
123B
27 3.00 
(1) 
Viewport
Kameron
204 2.96 (23) 
Browser Windows Size
Mehrshad Farzaneh
11 1.00 (1) 
Window Size Helper
Azamat Ciobeer
26 0.00 (0) 
ScaleBrowser
jalesh
- 0.00 (0) Screen Width Indicator
Nazar
1 0.00 (0) Window Resizer
EB Marketing
1 0.00 (0) Window Resize Simple
Jan
1 0.00 (0)