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Best Postbox Alternatives
Here are some Firefox add-ons that are similar to Postbox:
Abstract Background
Haris
- 0.00 
(0) 
Light Blue Background Theme
Suriyaa Sundararuban
48 5.00 (3) 
Blue_Box
lucapo-1364602664.01
- 0.00 (0) 
purple search
picture03
- 0.00 (0) 
PostYellow
Firefox user 13065624
- 0.00 (0) 
Rainy Night Blue
Easy-on-Eyes
1 5.00 (1) 
Spring-Background
Jecob
- 0.00 (0) 
Blue Space
St4ndd
2 0.00 (0) 
brownie
aidar
1 4.50 (2) 
Default theme v3
MasterKugelblitz
2 0.00 (0) 
Grey boxes
JosephHails
- 0.00 (0)