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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
624 4.18 (11) 
Video Speed Control Plus
Randyl
1 0.00 (0) 
SpeedTube - Video Speed Controller
DevasMIN
- 0.00 (0) 
Video Speed Controller
EVar
76 0.00 (0) 
Playback Speed Extension
Peter W
11 0.00 (0) 
Video Speed control play
Escanor
1 0.00 (0) 
Simple Video Speed Controller
Chaseos Apps
97 0.00 (0) 
SpeedBang - Video Speed Booster
Synthra Labs
10 0.00 (0) 
Video Speed Controller
Igrigorik
612 4.00 (16)