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Best Darkening Alternatives
Here are some Firefox add-ons that are similar to Darkening:
firefox evening
akalankamedia
14 5.00 
(4) 
Orange bird sunset
alex
- 0.00 (0) 
Birds at sunset
PouleY
- 0.00 (0) 
sunsetsoaring
Laurie
- 0.00 (0) 
Gulls at dawn
navajo
1 0.00 (0) 
The Flock of Birds
Firefox user 10499642
- 0.00 (0) 
Birds...
mrs.maughan
- 0.00 (0) 
flying at sunset
rositza
- 0.00 (0) 
Bird and Lightning
SallyAnnDefleur
- 0.00 (0) 
Darker Thunderbird
nefycee
- 0.00 (0) 
Birds in the morning
jupiter93
- 0.00 (0)