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Best Houstonopolis Alternatives
Here are some Firefox add-ons that are similar to Houstonopolis:
City Theme: Houston
TJ Huntley
1 4.00 
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Blue Hurricane
Meandering
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HP Blue
karthikeyan_dexter
1 4.00 (1) 
Red City
NIGHTmare2oo8
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Black&Orange
Vadim
1 5.00 (1) 
Gtuned Colored
Gtuned
- 0.00 (0) 
Gotham City
Dinosaur Eggs
1 0.00 (0) 
Hotpink
Sippycup
- 0.00 (0) 
Multicolored Theme
Golden Pineapple
- 5.00 (1) 
Neon Cityscape
dbry96
- 0.00 (0) 
SG Colors
SpicyGame Studios
- 0.00 (0) 
petrol oil colors
Firefox user 14801741
- 0.00 (0)