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Best CoolKeys Alternatives
Here are some Firefox add-ons that are similar to CoolKeys:
Dark Piano Keys
asfmacdude
13 5.00 
(2) 
Grey Piano Keys
jessicrap
- 0.00 (0) 
Broken Piano
chicagonative13
1 5.00 (2) 
PianoTheme15
qesefunda
- 0.00 (0) 
Piano Darkness
gfp6302
- 5.00 (2) 
kinky keys
howsab
- 0.00 (0) 
black-keys
emtune
- 0.00 (0) 
Notes and Keys
cubbaroo2
- 0.00 (0) 
Colorful Music Notes
Firefox user 14032441
- 0.00 (0) 
Illuminated Keyboard
Farhan R.
- 0.00 (0) 
Keyboard Remix
TCdesigns
- 0.00 (0) 
Lilting Piano Keys
demima
- 3.50 (2)