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Best Hyper Silence Alternatives
Here are some Firefox add-ons that are similar to Hyper Silence:
Blue Silence
babsie001
- 0.00 
(0) 
Green silence
VadimIlin
- 0.00 (0) 
Minimal Purple
Firefox user 10204762
1 5.00 (1) 
space purple
A n n
- 0.00 (0) 
BlueSilence
beatle959
- 0.00 (0) 
Just Purple
Alexis Andriopoulos
- 4.00 (2) 
Soft Purple Lights
Tracee
- 0.00 (0) 
Purple-Light
Mel_88
- 0.00 (0) 
Blue and Silver Silent
Thorpe1987
- 0.00 (0)