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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
97K 4.54 (799) 
Video Speed Wheel
frort
- 0.00 (0) 
YT Speed
Arimtak
8 5.00 (1) 
Video Speed Controller X
Danny Lin
12 0.00 (0) 
Video Playback Speed Adjuster
minhquangdn
16 0.00 (0) 
SpeedMaster: Custom Playback Speed for Videos
HC
92 5.00 (2) 
MarkN Video Speed
MarkN
1 0.00 (0) 
Simple Video Speed Controller
Chaseos Apps
108 0.00 (0) 
simple YouTube speed controls
Baumkuchen
1 5.00 (1) 
Custom Video Speed Controller
Hugo Nordström
1 0.00 (0)