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Best Speed It Up Alternatives
Here are some Firefox add-ons that are similar to Speed It Up:
Playback Speed Extension
Peter W
20 0.00 
(0) 
Playback Speed Control
dougg0k
82 0.00 (0) 
Video Speed Controller X
Danny Lin
12 0.00 (0) 
Simple Video Speed Controller
Chaseos Apps
110 0.00 (0) 
YouTube Playback Speed Ct
Vicz Kumat
- 0.00 (0) Video Speed Master
BruttoBernd
2 0.00 (0) 
Video Playback Speed Controller
incaendium
20 0.00 (0) 
YouTube Speed Controller
Samuel Li
1K 4.08 (37) 
Video Speed Controller MV3
mvalles
133 4.70 (10) 
Web Video Speed Controller
aynor
495 4.18 (11) 
Video Speed Controller
codebicycle
98K 4.54 (799) 
SpeedMe
Bryley
1 0.00 (0)