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Best SpeedZ Alternatives
Here are some Firefox add-ons that are similar to SpeedZ:
SpeedX
Acker
8 0.00 
(0) 
Video Speed Controller
Acker
2 0.00 (0) 
Video Speed Controller
codebicycle
103K 4.53 (800) 
Video Speed Wheel
frort
1 0.00 (0) 
Video Speed Controller X
Danny Lin
13 0.00 (0) 
Video Playback Speed Adjuster
minhquangdn
15 0.00 (0) 
SpeedMaster: Custom Playback Speed for Videos
HC
103 5.00 (2) 
Simple Video Speed Controller
Chaseos Apps
97 0.00 (0) 
Video Speed Control
Sevina
3K 4.27 (26) 
SpeedyVideo Extension
Great Idea Technology Limited
449 5.00 (4) 
Video Speed Controller
seoxiis
214 3.00 (4) 
speederVideo
haleem
6 0.00 (0)