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Best Messenger Alternatives
Here are some Firefox add-ons that are similar to Messenger:
messageres
birdyann
- 0.00 
(0) 
Yahoo Messenger
BLKoldSUN
1 0.00 (0) 
Messenger of Islam
abdo
- 0.00 (0) 
Messenger Popup
Schmextensions
9 5.00 (1) 
Messenger as a Sidebar
Newstack Digital Agency
302 4.33 (9) 
Telegramapp
behrangnamdari
- 0.00 (0) 
Messenger & Notifier for Facebook™
Glin
60 2.50 (12) 
Mozilla
Firefox user 12899618
8 3.86 (7) 
Messenger Dark Mode
zeraye
65 5.00 (5) 
messenger for poweruser
aloisleclet
1 0.00 (0) 
Explorer
metalerix
- 0.00 (0) 
mailtheme
Firefox user 14032441
- 0.00 (0)