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Best Sinister Alternatives
Here are some Firefox add-ons that are similar to Sinister:
Sinister Productions
jalenlee
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Sinister_Dark
Firefox user 12310817
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Sinister With Z
Firefox user 14240650
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Something Diabolical
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Dark Evil
Black01
- 4.00 (1) 
MadEvil
Fahad
- 0.00 (0) 
The Dark
1Closed
- 1.00 (1) 
Dark Supernatural
DS Carver
- 5.00 (1) 
Devious
Laja_Knight
- 0.00 (0) 
Dark Demon
Jans One
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Satanic
R0ck4x3
- 0.00 (0) 
sinister tech
epicpotato
- 0.00 (0)