Miscellaneous

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SmartTemplate4

SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.

Rated 5 out of 5 stars (42)
15,446 users

Update Channel Selector

Allows you to change the application update channel.

Changing only the channel with Gecko 12 became insufficient because it's "*.mar" related security landings.

Rated 3 out of 5 stars (10)
11,685 users

BBCodeXtra

BBCodeXtra is an extension, compatible with Mozilla FireFox and Seamonkey, which adds to the context menu new commands to insert BBCode/Html/XHtml codes in an easy and fast way...

Rated 5 out of 5 stars (49)
10,045 users

Calculator

Calculator has an interface similar to Microsoft Powertoy Calculator and it offers great features like history, conversions, many functions... And it's a great open source replacement to the calculator included in Windows accessories!

Rated 4 out of 5 stars (94)
8,247 users

SyncKolab

SyncKolab can synchronize your calendar, address book and tasks against an IMAP server in Kolab formats version 1 (vCard/iCal) or version 2 (XML) or turn your Thunderbird/Lightning into a native Kolab Client (http://kolab.org).

Rated 3 out of 5 stars (71)
7,813 users

Add-ons Manager Context Menu

Add more items to Add-ons Manager context menu.

Rated 5 out of 5 stars (21)
7,044 users

Gmail Manager NG

Based on Gmail Manager by Todd Long. This fork is intended to a supported version of Gmail Manager since Todd appears to have gone MIA. Manage multiple Gmail accounts and receive new mail notifications.

Rated 4 out of 5 stars (79)
6,149 users

FiltaQuilla

Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.

Rated 4 out of 5 stars (34)
6,148 users

Simple Clocks

Track time in locations world-wide

Rated 4 out of 5 stars (27)
6,079 users

Tab notifier

Enables desktop notifications like in Chrome (e.g. Gmail, imo.im) and, if the site doesn't support them, it can notify new messages or updates detecting changes of the title (e.g. Hotmail, Yahoo, Facebook, Twitter). Even if the browser is minimized!

Rated 4 out of 5 stars (29)
5,895 users

Send Filter

This add-on allows you run your message filters automatically on outgoing messages after sending. In other words, it's a outgoing filter for thunderbird and seamonkey.

Rated 4 out of 5 stars (32)
4,613 users

Year view

Year view for calendar.

Rated 4 out of 5 stars (42)
4,111 users

OverbiteFF

Add legacy protocol support back to Firefox and SeaMonkey with OverbiteFF, which restores support for Gopher servers, plus CSO/ph searches, finger, whois and more! Cross-platform JavaScript runs anywhere Firefox does.

Rated 5 out of 5 stars (15)
3,811 users

Clean Subject

"Clean Subject" cleans the subject from multiple occurrences of subject prefixes such as ("Re: Re-2: Re:") and postfixes that are inserted by other clients. Words like "[SPAM]" can be cleaned as well. These prefixes can be defined in the preferences.

Rated 4 out of 5 stars (37)
3,715 users

Copy Sent to Current

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 (51)
3,413 users

Extension Auto-Installer No Restart

For extension developers: allows automatically adding or updating browser extensions, e.g. with command line tools.

Rated 5 out of 5 stars (10)
2,866 users

1-click Online Document View

Open DOC, DOCX, PDF, PPT, PPTX and TIFF files linked in any webpage directly with Google Docs viewer using "1-click Online Document View", with a single left-click of your mouse / trackpad!!

Rated 4 out of 5 stars (5)
2,480 users

MathML-fonts No Restart

Fonts for Mozilla's MathML engine.

Rated 5 out of 5 stars (2)
2,368 users

Contact Photos

Displays contact photos in the message header.

Rated 4 out of 5 stars (21)
2,172 users

ToneQuilla

Adds a new action to mail filters to allow playing a particular sound when the filter matches. Also includes several sample sound files.

Rated 4 out of 5 stars (14)
2,169 users