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Zindus Requires Restart

Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)

Rated 4 out of 5 stars (199)
19 users

Gmail Manager Requires Restart

The original Gmail notifier for multiple accounts. Allows you to receive new mail notifications along with viewing account details including unread messages, saved drafts, spam messages, labels with new mail, space used, and new mail snippets.

Rated 4 out of 5 stars (1,151)
0 users

Personal Level Indicators Requires Restart

Shows an indicator so you can tell if an email was addressed only to you (»), a group (›), or a mailing list.

Rated 4 out of 5 stars (11)
23 users

WebPG for Mozilla Requires Restart

An extension which provides GnuPG/GPG/PGP related functions to Moizilla Firefox, Thunderbird and Seamonkey

Rated 3 out of 5 stars (24)
2 users

Lock The Text Requires Restart

Encrypt your text data in browser before you submit it to a network

Rated 5 out of 5 stars (10)
1 user

(G)mailto:

(G)mailto: Will load in a Firefox's tab a new email at Google Mail, so you'll start writing to that email you typed.

Rated 4 out of 5 stars (10)
15 weekly downloads

Email This! Requires Restart

Email This! will send your recipient the link, title, & highlighted text of the page you are viewing using GMail, Google Apps GMail, Yahoo, and Stand-Alone Mail Clients like Outlook Express, Thunderbird, & More!

Rated 5 out of 5 stars (64)
0 users

Gmail Manager-community Requires Restart

Manage multiple Gmail accounts and receive new mail notifications.

Rated 3 out of 5 stars (33)
3 users

Gmail S/MIME Requires Restart

Send and receive signed and encrypted messages in Gmail.

Rated 3 out of 5 stars (46)
2 users