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Best SpeedUp Alternatives
Here are some Firefox add-ons that are similar to SpeedUp:
YouTube Speed Master
pets
50 0.00 
(0) 
Youtube Speedier
dglsparsons
- 3.00 (1) 
YouTube Speed Toggle
jojihatzz
2 0.00 (0) 
Speeder - YouTube Speed Controller
doroved
52 5.00 (1) 
YouTube Speed Controls
iVideoGameBoss
24 3.00 (1) 
YouTube Speed Modifier
HadriX
1 0.00 (0) 
YouTube Video Speeds++
NaeemBolchhi
6 0.00 (0) 
YT Better Speedslider
Isaiah
5 0.00 (0) 
YT Auto Speed
JNP
3 0.00 (0) youtube speed control shortcut
mln
6 0.00 (0) 
YouTube Speed x3 b8q
Dejsp
4 1.00 (1) 
Youtube Speed Controller
Absar Ahmad
107 5.00 (2)