Miscellaneous

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Mail Redirect Requires Restart

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

Rated 4 out of 5 stars (133)
34,941 users
Updated March 1, 2020

Custom Sender Address and Reply Requires Restart

Select sender mail address based on the recipient and reply with the same address

Rated 5 out of 5 stars (1)
8 users
Updated Nov. 6, 2019

Flexible Identity Requires Restart

Selects an identity based on the recipients list when sending an email

Rated 4 out of 5 stars (39)
696 users
Updated Nov. 5, 2019

Year view Requires Restart

Year view for calendar.

Rated 4 out of 5 stars (51)
444 users
Updated June 26, 2019

AutoCopy_rebirth Requires Restart

Lightweight add-on that automatically copies any highlighted text to clipboard.

Rated 5 out of 5 stars (4)
25 users
Updated March 13, 2019

ImportExportTools Requires Restart

Adds some tools to import and export folders and messages

Rated 4 out of 5 stars (232)
51,263 users
Updated Jan. 27, 2019

Highlighter Requires Restart

Quickly highlight some text in Thunderbird message composing windows.

Rated 4 out of 5 stars (91)
2,018 users
Updated Nov. 21, 2018

Join-NG Requires Restart

Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".

Rated 5 out of 5 stars (5)
2,271 users
Updated Nov. 11, 2018

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 (32)
75 users
Updated June 13, 2018

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 (23)
213 users
Updated June 13, 2018

CardDAV Browser Requires Restart

A utility to browse vCards stored on a CardDAV server.

Rated 3 out of 5 stars (7)
52 users
Updated June 5, 2018

Contact Photos Requires Restart

Displays contact photos in the message header.

Rated 4 out of 5 stars (30)
256 users
Updated Nov. 23, 2017

Caret Out Requires Restart

IMEオフ時に誤ってF7キーを押した際に、キャレットブラウズモードが有効になるのを防ぎます。F7キーを用いてカタカナ変換を行う日本語圏向けのアドオンです。

Rated 5 out of 5 stars (4)
2 users
Updated Nov. 3, 2017

Mouse Gestures Suite Requires Restart

Mouse gestures for SeaMonkey & Firefox: navigate & execute commands using mouse gestures (with single mouse button) and rocker gestures (by pressing 2 mouse buttons). Also: scroll wheel navigation, page scrolling, tab scrolling.

Rated 5 out of 5 stars (61)
130 users
Updated Oct. 21, 2017

Lightbird Requires Restart

Standalone calendar UI for Lightning

Rated 4 out of 5 stars (21)
961 users
Updated Aug. 5, 2017

techblocker

Search with Joy! Block Ads While Surfing!

Rated 5 out of 5 stars (3)
32 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 (35)
3 users
Updated July 4, 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 (300)
153 users
Updated June 10, 2017

Addons Recent Updates Requires Restart

Show more addons recent updates

Rated 5 out of 5 stars (11)
52 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 (35)
12 users
Updated April 23, 2017