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Best Sullen Alternatives
Here are some Firefox add-ons that are similar to Sullen:
Sullen Mood
ZxNuClear
- 0.00 
(0) 
Dull Grey
shafin
- 0.00 (0) 
Gloomy
mariannajaime
4 0.00 (0) 
Gloom
Ryath
1 4.50 (4) 
somber1
427
- 0.00 (0) 
mur sombre
erikmrp
- 0.00 (0) 
sombre
labskull
62 5.00 (1) 
Dark Succulent
Lettuce
- 0.00 (0) 
Tranquil
Nicola83
- 0.00 (0) 
Slothulous
Firefox user 10615630
1 0.00 (0) 
Boring Grey
iemmanuelwash
- 0.00 (0) 
Deadpan
limzcc
- 0.00 (0)