Miscellaneous

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Classic Toolbar Buttons No Restart

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

Beta builds on versions page!

Rated 5 out of 5 stars (141)
40,974 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (189)
40,315 users

ProfileSwitcher

It adds some options to launch easily other profiles and the Profile Manager.

Rated 5 out of 5 stars (57)
40,183 users

Copy Plain Text 2

Copies text without formatting

Rated 5 out of 5 stars (55)
36,443 users

Display Quota

This extension will display the current status of your IMAP quota in thunderbird's statusbar and will warn you when you reach a configurable limit...

Rated 4 out of 5 stars (28)
34,225 users

Font Finder

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

Rated 4 out of 5 stars (65)
33,524 users

Tiny JavaScript Debugger

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.

Rated 4 out of 5 stars (5)
32,980 users

Mail Redirect Featured

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

Rated 4 out of 5 stars (122)
32,123 users

Email Signature - WiseStamp

Signatures for Gmail, Google Mail, Yahoo Mail

Rated 4 out of 5 stars (301)
30,520 users

PrintingTools

Adds some options to print messages and addressbooks

Rated 4 out of 5 stars (21)
27,344 users

QuickNote

A simple note-taking extension.

Rated 5 out of 5 stars (167)
25,944 users

Cleanest Addon Manager No Restart

Cleanup your Addon Manager

Rated 5 out of 5 stars (122)
25,657 users

Copy As Plain Text

Removes formatting from copied text.

Rated 4 out of 5 stars (50)
24,017 users

AutoCopy

Select text and it's automatically copied to the clipboard. Also pastes on middle click.

Rated 4 out of 5 stars (521)
24,017 users

Filter Uploader for Adblock Plus

DOES NOT BLOCK ADS! Don't install this add-on if you don't know what 'uploading' means!

This add-on Uploads the filters from your Adblock Plus installation to a FTP, HTTP, HTTPS server...

Rated 3 out of 5 stars (45)
23,945 users

Thunderbird Message Filter Import/Export Enhanced

Thunderbird Message Filter Import/Export Enhanced is a compatibility port of Wind Li's add on.
Original add on here: https://addons.mozilla.org/en-US/thunderbird/addon/thunderbird-message-filter-imp/

Rated 3 out of 5 stars (37)
22,618 users

LightningButton

Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.

Rated 4 out of 5 stars (13)
22,530 users

Dropbox for Filelink

Add Dropbox support to Thunderbird's Filelink feature.

Rated 4 out of 5 stars (33)
20,856 users

Dafizilla Table2Clipboard

Mozilla applications allow to select rows and columns from a table simply pressing Control key and picking rows/columns with left mouse button.
The selection can be copied to clipboard but the original table disposition is lost making ugly results wh...

Rated 5 out of 5 stars (63)
20,245 users

Google Tasks Sync

Manage your tasks from Thunderbird, even while offline.

Rated 4 out of 5 stars (60)
19,335 users