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Best Old messenger.com Alternatives
Here are some Firefox add-ons that are similar to Old messenger.com:
FNotifier
qbasekostas
1 0.00 
(0) 
Messenger & Notifier for Facebook™
Glin
61 2.50 (12) 
F-Notifier
Arnaud Ligny
40 4.17 (12) 
nonewsfeed
Firefox user 12265463
3 5.00 (1) Gray Notifications for Facebook
Earldawson
- 0.00 (0) 
Messenger as a Sidebar
Newstack Digital Agency
302 4.33 (9) 
Hide Facebook Chat
Firefox user 14163118
9 0.00 (0) Gray Facebook Notifications
Victor Mours
2 5.00 (1) 
facebook messenger in sidebar
Frynx
75 5.00 (1)