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Best Volume Booster Alternatives
Here are some Firefox add-ons that are similar to Volume Booster:
Volume Booster
Wowstar
513 3.60 
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Hudnall
53 0.00 (0) 
Volume Booster — Up to 600%
Volume Booster
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SBIOMSS
238 0.00 (0) FF Sound Booster
Verocia
4 0.00 (0) 
Volume_Booster
Harshvardhan Wadekar
59 5.00 (2) More Volume - Volume Booster
jb
1 0.00 (0) Volume Boost for me only
archer0646
1 0.00 (0) 
Volume Control - Boost Audio & Video
Unemployed
25 0.00 (0) 
Sound BoosterS
Running Track
3 5.00 (2) 
Volume Booster
yaagame
516 3.86 (7) Max Sound Booster
Running Track
6K 4.64 (14)