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Best Sound Boost Alternatives
Here are some Firefox add-ons that are similar to Sound Boost:
Volume Booster Ultra
zenderman_
721 4.22 
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Sound Booster — Increase sound
Nick Brownie
967 4.83 (48) 
Amplify – Tab Volume Control
rynmon
26 0.00 (0) 
Volume Booster — Enhance sound
Volume Master
464 3.33 (3) 
Ultra Volume Booster
Igrigorik
147 4.57 (7) 
Vol Boost
DevSOA
296 5.00 (2) 
600% Sound Volume
Aliaksandr
223K 4.50 (3,827) 
Volume Booster
Rama Vats
9 0.00 (0) 
Volume Booster
Gareth Ellis
15K 2.64 (39) 
Sound Booster
codehemu
10K 4.52 (21) 
SoundLift – Volume Booster
Chrg_Bsr
915 4.29 (7) 
Volume booster
Volume Booster
61 0.00 (0)