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Best Quick Play Alternatives
Here are some Firefox add-ons that are similar to Quick Play:
Global Speed 视频加速器
spjs
6K 4.75 
(8) 
Global Speed: 视频速度控制
kenny
6K 5.00 (4) 
视频加速快进
dev
44 0.00 (0) 
Web Video Speed Controller
aynor
527 4.18 (11) 
0.05 + - video speed controller
Ariyul İstanbul
1 0.00 (0) 
Custom Video Speed Controller
Hugo Nordström
- 0.00 (0) Video Speed Control Plus
Randyl
1 0.00 (0) 
SpeedTube - Video Speed Controller
DevasMIN
1 0.00 (0) 
Video Speed Controller
EVar
80 0.00 (0) 
Playback Speed Extension
Peter W
16 0.00 (0) 
Video Speed control play
Escanor
1 0.00 (0) 
universal-video-speed-ctrl
danishansari-dev
- 5.00 (1)