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Best Mail in Sync Alternatives
Here are some Firefox add-ons that are similar to Mail in Sync:
CookieSync
violet945786
7 5.00 
(1) 
mail.com MailCheck
1&1 Mail & Media GmbH
1K 2.70 (82) 
UniMail — Unified Inbox
YeomanYe
- 0.00 (0) Mail Checker for Gmail
teadeermayonnaisefly
1 0.00 (0) InboxClean AI — Email Cleaner
Wooduck
1 0.00 (0) Message Syncer
Scott Gordonan
- 0.00 (0) 
Simplify Gmail
Michael Leggett
822 4.64 (140) 
Gmail++
Michael Pfaff
1 0.00 (0) 
Email Checker for Gmail™
Sergey
1 0.00 (0) 
Google Mail Checker
CirnoT
142 0.00 (0) 
CRM Email Sync - HubSpot Gmail Addon 100% FREE
CRM Email Sync
123 5.00 (1) 
Gmail Theme Sync
Bernhard Danecker
2 0.00 (0)