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Best twvolume Alternatives
Here are some Firefox add-ons that are similar to twvolume:
Twitter Volume Control
Firefox user 12512492
190 2.71 
(7) 
YouTube Volume Control
Steve
120 5.00 (1) 
Twitch Chat Width
Olive
2 0.00 (0) 
Volume Booster for Twitch™
Joe Ertaba
390 5.00 (1) 
Arrow up-down Twitch volume
yoshu
4 0.00 (0) 
Youtube Volume Scroll
Araxeus
2K 4.33 (24) 
Viki Volume Control
zvbt
- 0.00 (0) 
Tidal long volume slider
VirusBLITZ
8 5.00 (2) 
BitChute Volume Scroller
Toby
1 0.00 (0) 
Scroll Video Volume with Mouse Wheel
Umbrella
- 0.00 (0) 
volume manager
entomb3nt
6 0.00 (0) 
Safest Volume Booster
Gaurav Patidar
2 0.00 (0)