Miscellaneous

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Send Later Requires Restart

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (102)
60,081 users
Updated September 26, 2017

Mail Redirect Requires Restart

Allow to redirect (a.k.a. "remail") mail messages to other recipients.

Rated 4 out of 5 stars (125)
34,506 users
Updated September 23, 2017

PlayFlash 64bit Requires Restart

Flash player plugin - unofficial xpi repack for 64bit browsers. Use when official plugin installer is not suitable. All binary files are copyrighted by their authors and distributed for free.

Rated 5 out of 5 stars (21)
6,334 users
Updated September 22, 2017

PlayFlash 32bit Requires Restart

Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.

Rated 5 out of 5 stars (20)
11,536 users
Updated September 22, 2017

Copy Sent to Current Requires Restart

Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.

Rated 4 out of 5 stars (67)
2,916 users
Updated September 15, 2017

Thunderbird Integration for JIRA Requires Restart

This is a plugin for Thunderbird 3.3+ which is able to create Atlassian Jira issues out of e-mails or add the content of an e-mail as a comment on an Jira issue.

Rated 4 out of 5 stars (10)
355 users
Updated September 8, 2017

ToggleReplied Requires Restart

Enables toggling of replied, forwarded, and redirected states of messages.

Rated 4 out of 5 stars (1)
20 users
Updated August 18, 2017

Lightbird Requires Restart

Standalone calendar UI for Lightning

Rated 4 out of 5 stars (17)
2,954 users
Updated August 5, 2017

techblocker

Search with Joy! Block Ads While Surfing!

Rated 5 out of 5 stars (2)
20 users
Updated July 7, 2017

AutoProxy-ng Requires Restart

This is a fork of AutoProxy, which can run the latest version of Firefox.

Rated 5 out of 5 stars (30)
4,033 users
Updated July 4, 2017

Reply to Multiple Messages

Add menu commands for replying to multiple messages at the same time.

Rated 5 out of 5 stars (1)
158 users
Updated June 16, 2017

CardDAV Browser Requires Restart

A utility to browse vCards stored on a CardDAV server.

Rated 3 out of 5 stars (4)
1,051 users
Updated June 14, 2017

UnMHT

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

Rated 4 out of 5 stars (246)
82,741 users
Updated June 10, 2017

Addons Recent Updates Requires Restart

Show more addons recent updates

Rated 5 out of 5 stars (10)
1,261 users
Updated April 24, 2017

InfoLister Requires Restart

Lists installed add-ons (extensions, themes, plugins). Mozilla does not allow me to publish the version compatible with Firefox 48+, see http://forums.mozillazine.org/viewtopic.php?f=48&t=2084957&p=14715558#p14715558 for details.

Rated 4 out of 5 stars (34)
753 users
Updated April 23, 2017

Lightning Requires Restart Featured

Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.

Rated 3 out of 5 stars (1,840)
5,936,783 users
Updated April 20, 2017

tzpush Requires Restart

Z-Sync to Thunderbird Addressbook
Will sync Thunderbird address book to Zentyal, Zarafa, Horde and outlook.com/hotmail.

Rated 4 out of 5 stars (16)
2,142 users
Updated April 16, 2017

Direct Currency Converter for SeaMonkey

Converts prices from any currency ($, £, etc.) to prices in a selectable currency automatically while browsing.

Not yet rated
25 users
Updated April 15, 2017

Contact Photos Requires Restart

Displays contact photos in the message header.

Rated 4 out of 5 stars (25)
2,222 users
Updated April 15, 2017

gContactSync Requires Restart

Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.

Rated 4 out of 5 stars (224)
84,896 users
Updated April 14, 2017