Top-Rated Extensions

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Lightning Multiweek View

Adds a multiweek view to...

Rated 2 out of 5 stars (4)
80 users

nntpthreads

Nntpthreads lets you add up to four new buttons in the toolbar to easily access the menu item from "View > Threads"...

Rated 2 out of 5 stars (4)
26 users

Wunderlist Task Button

Non-official addon for Wunderlist. Easily transform a mail into a task for Wunderlist with a single click.

Rated 2 out of 5 stars (7)
263 users

Year View

This is an example extension that adds a simple year view to Sunbird/Lightning.

Note that freebusy information is only provided if all calendars are cached. See long description for more info. Also, Calendar 1.0pre with bug 489590 fixed is required.

Rated 2 out of 5 stars (5)
13 users

mozCleaner No Restart

Cleans your Firefox, Thunderbird, SeaMonkey, Fennec (unstable), Instantbird and BlueGriffon.

Rated 2 out of 5 stars (5)
2,123 users

Tabbed Mail Preferences

Enhances control over some aspects of tabbed mail browsing.

Rated 2 out of 5 stars (2)
3 users

PassToScript extension

Extension to pass e-mail in eml (raw) format directly to the script specified

Rated 2 out of 5 stars (2)
21 users

Boomerang

Boomerang E-Mail is an Add-on for the Thunderbird E-Mail-Client and is based on the Boomerang e-Mail algorithm (patent pending).

It provides functionality to send a certain e-mail (including attachments) to several recipients one after the other and...

Rated 2 out of 5 stars (6)
4 users

CALDAV - Search/Subscribe

Add CalDAV search & subscribe feature to Lightning

Rated 2 out of 5 stars (7)
1,763 users

Nightly Tester Tools Lite

This is a cut down version of Nightly Tester Tools by Mossop, which is 77.6 KB. I've only included the "copy build id" and "build id in titlebar"...

Rated 2 out of 5 stars (8)
92 users

Purge Events

Purge events from Sunbird and Lightning calendars

Rated 2 out of 5 stars (6)
162 users

Test Pilot for Thunderbird No Restart

Add-on has now been discontinued, see below.

Rated 1 out of 5 stars (15)
9,155 users

Re: Sort

「Re2:」「Re4:」というふうに「Re:」をまとめます。

Rated 2 out of 5 stars (1)
32 users

Cairo-Dock unread messages

Displays the number of unread messages in all inboxes on your dock.

Rated 2 out of 5 stars (1)
200 users

Spoof Detector

Extension for Email Spoofing Detection

Rated 2 out of 5 stars (1)
66 users

forcebutton

This add-on can resend mails, so you "force" the other side to answer. It could be useful at corporate environment.

Rated 2 out of 5 stars (1)
55 users

DOM Inspector - Mac OS X

Inspect the DOM of HTML, XUL, and XML pages, including the mail...

Rated 2 out of 5 stars (1)
1 user

FlatStyle for Thunderbird

This gives you a style similar to MS Office XP in your Thunderbird menus and toolbars, and Calendar as well if you have that installed. It also changes the category-selector in the options window to use your system colors, instead of always being...

Rated 2 out of 5 stars (1)
80 users

Disable Addons

Disable Addons.

Rated 2 out of 5 stars (1)
8 users

BccInfo

Send any additional information to your BCC recipient.

Rated 2 out of 5 stars (2)
71 users