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Best Protostar Alternatives
Here are some Firefox add-ons that are similar to Protostar:
Starbirth
digitalblasphemy
8 4.88 
(8) 
Starlight Grotto
digitalblasphemy
7 4.81 (16) 
Celestrom
digitalblasphemy
1 0.00 (0) 
Xenotron
digitalblasphemy
1 0.00 (0) 
Circumpolar
digitalblasphemy
- 0.00 (0) 
Sublimation
digitalblasphemy
36 4.63 (24) 
Genesis
digitalblasphemy
11 4.64 (11) 
Enshrouded
digitalblasphemy
1 4.00 (1) 
Coalescence
digitalblasphemy
- 0.00 (0) 
Nocturne
digitalblasphemy
- 0.00 (0) 
Afterglow
digitalblasphemy
1 0.00 (0) 
Planitia
digitalblasphemy
- 0.00 (0)