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Best 2X Speed Alternatives
Here are some Firefox add-ons that are similar to 2X Speed:
Quick Video Speed Toggle (1x-2x)
amerikanci
3 0.00 
(0) 
YouTube 2x Speed
Duke551
1 0.00 (0) 3xYouTube
ipfluxio
118 2.00 (1) 
Hold for 2X Speed
Chandra Kant
2 0.00 (0) 
Speeder - YouTube Speed Controller
doroved
61 5.00 (1) 
YT Speed Quick Access
Tianyi Lab
5 5.00 (2) 
Video Speed Up
no9
2K 4.38 (26) 
SpeedUp
E M
17 0.00 (0) 
YouTube Custom Playback Speed
Chris
8 0.00 (0) 
YT Left-Click Speed Editor
Extron
- 0.00 (0) 
Youtube Speedier
dglsparsons
- 3.00 (1)