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Best YTSync Alternatives
Here are some Firefox add-ons that are similar to YTSync:
Synctastic
Ddone
- 5.00 
(1) 
Sync Watch
Semro
1K 4.95 (20) 
YouTube Tweak - Boost Your YouTube Experience
Dark495
117 5.00 (1) 
CommentSync - Real-time YouTube Comments
motade
28 5.00 (1) 
'Improve YouTube!' 🎧 (For YouTube & Video)
code-for-charity
103K 4.29 (887) 
TubeTweaks
XenoExtensions
103 3.71 (7) 
Sync Watch
Schyler
1 0.00 (0) 
Youtube Empowered
Magnus Anderson
1 5.00 (1) 
SyncUp
Basishoef
73 0.00 (0) 
BetterYT - Better YouTube
room
35 5.00 (5) 
YouTube Auto Like
pg
2K 4.67 (101) 
Sync
kaangiray26
12 0.00 (0)