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Best OpenSync Alternatives
Here are some Firefox add-ons that are similar to OpenSync:
Sync Watch
Schyler
1 0.00 
(0) 
SyncUp
Basishoef
97 0.00 (0) 
CineSync — Watch Together
Yen
1 0.00 (0) 
SyncClick
vNoisy
3 0.00 (0) 
KoalaSync
HungryKoala
56 0.00 (0) 
VideoSync
rafket
3 0.00 (0) 
Synctastic
Ddone
1 5.00 (1) 
Stream Together
Hank Brekke
112 4.20 (5) 
YouTube Sync
Vano Zabe
11 5.00 (1) 
Sync Everything
kaangiray26
7 0.00 (0) 
What to Watch Sync
Fifthwye
1 0.00 (0) 
Sync
kaangiray26
12 0.00 (0)