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Best Covert Alternatives
Here are some Firefox add-ons that are similar to Covert:
discreet
sanny
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(0) 
Sneaky
Firefox user 13487757
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Stealthy Predator
Smig
- 0.00 (0) 
Hiding
AcumasAngel
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Stealth simple
ratshaverights
- 0.00 (0) 
out of the shadows
mormorfox
- 0.00 (0) 
operational camouflage
Sergeant Wise Graphix
- 0.00 (0) 
Devious
Laja_Knight
- 0.00 (0) 
shadow invisible
megpoid-1364603523.39
- 0.00 (0) 
Classified
coxy822
- 5.00 (1) 
Subtle
mavern
- 0.00 (0) 
Undercover Invader
madthunder
- 0.00 (0)