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Best bootstrap12 Alternatives
Here are some Firefox add-ons that are similar to bootstrap12:
Bootstrap - Responsive Helper
Kevin Bon
545 4.38 
(13) 
CSS Grid
Olehjov
6 0.00 (0) 
Gridly
Naveed SNR
12 5.00 (1) 
OLI Grid CSS
Kushan Gunasinghe
346 4.33 (9) 
Baseliner
jpedroribeiro
64 4.33 (6) 
SeLite Bootstrap
Peter Lyons Kehl
1 0.00 (0) 
Responsive Grid
thisisjamessmith
- 0.00 (0) 
template grid
hawkenfox
- 0.00 (0) 
CSS Grid Visualizer
Brandon Scott
1 0.00 (0) 
Gridt
gavink
21 0.00 (0) 
PixelGrid
Sergey Zwezdin
60 4.50 (2) 
Breakgrid – Responsive Viewport Tester
ByteSide.io
19 0.00 (0)