Rescue Conflicting Alternatives

Renders conflicting alternative bodies if the message has them.

CruiseControl Monitor Requires Restart

CruiseControl build monitor

Free Memory Button

Free unused memory that Firefox is currently using.

Slovak spell checking dictionary

Slovak spell checking dictionary for Mozilla applications (based on the "open-source" dictionaries by Zdenko Podobný).

Quicker Filer Requires Restart

Quicker Filer helps you file your messages into folders using keyboard shortcuts and quick search method. Navigate through folders by typing the start of a folder name and the Quicker Filer dialog will show you all folders that matches as you type.

Password Tags Requires Restart

Adds metadata and sortable tags to the password manager.

TamilVisai (TamilKey) Requires Restart

A utility for typing in Tamil language. It will be ideal for Tamil bloggers...

Restart application Requires Restart

Restart the application with one click (or Ctrl Shift Z)

Extension Manager Extended Requires Restart

Use the Addon Manager to view the id, date installed, compatible application versions, and the folder of an extension or theme. Check http://extended.spanglerco.com for more information and http://firefox.spanglerco.com for more extensions...

Before Tabs Toolbar Requires Restart

Adds a toolbar before the tabs.

Copy Message ID

Adds a button to the message view toolbar to copy the message ID to the clipboard. This is useful when sending email replies via the command line.

Page Colors & Fonts Buttons

Adds buttons to toggle the using the default page colors and fonts, and the page defined colors and fonts.

Sender Name Requires Restart

Enhanced Priority Display

Enhanced thread pane display of message priorities.

Lightweight Themes Manager

Manage your installed personas (lightweight themes).

DragToCompose Requires Restart

Enables dragging a file to Thunderbird for composing a new message without opening composer window first.

Nightly Tester Tools Lite Requires Restart

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"...

Show Password On Input Requires Restart

Gives an option to show the master password on input

SmartTemplate Requires Restart

This Add-on provides the smart and simple templates and abilities to customize the quote header flexibly.
Templates can be inserted automatically at the new/repling/forwarding message. A different template can be used respectively per account.

Zoom Button for Thunderbird Requires Restart

Zoom in, zoom out, and reset zoom with one toolbar button. Works in the Compose window too.