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Best MSync Alternatives
Here are some Firefox add-ons that are similar to MSync:
Watch Party Sync
Frederick Harrison
1 0.00 
(0) CineSync — Watch Together
Yen
1 0.00 (0) 
Sync View
f00d4tehg0dz
1 0.00 (0) 
Sync Watch
Schyler
1 0.00 (0) 
SyncUp
Basishoef
74 0.00 (0) MiniSync
Cuc
- 0.00 (0) StreamSync Chat
Van
- 0.00 (0) Message Syncer
Scott Gordonan
- 0.00 (0) Multi-Stream Chat Monitor
Amice
2 0.00 (0) 
Synclify
Andrea De Masi
250 5.00 (1) 
CommentSync - Real-time YouTube Comments
motade
28 5.00 (1) 
Synctastic
Ddone
- 5.00 (1)