Extensions by Weekly Downloads

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Theme Font & Size Changer No Restart

Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.

Rated 5 out of 5 stars (140)
5,773 weekly downloads

MinimizeToTray revived

Minimizes windows into the system tray.

Rated 5 out of 5 stars (289)
5,059 weekly downloads

X-notifier (for Gmail,Hotmail,Yahoo,AOL ...)

Notifier for gmail, yahoo, hotmail, aol and more webmails.
X-notifier(aka WebMail Notifier) checks your webmail accounts and notifies the number of unread emails...
Supports : gmail, yahoo, hotmail, POP3/IMAP, facebook, twitter and more

Rated 4 out of 5 stars (1,614)
4,893 weekly downloads

LookOut Featured

LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).

Rated 4 out of 5 stars (143)
4,744 weekly downloads

Image Zoom Featured

Adds zoom and rotation functionality for images...

Rated 4 out of 5 stars (327)
4,101 weekly downloads

KeeFox

Simple and secure password management. Login automatically, never forget another password, stay in control of your passwords and improve their security. Powered by the world-renowned KeePass Password Safe.

Rated 5 out of 5 stars (933)
3,883 weekly downloads

Google Contacts

Access to Google contacts and synchronize them with Thunderbird address books.

Rated 4 out of 5 stars (242)
3,863 weekly downloads

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)
3,810 weekly downloads

UnMHT No Restart

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 5 out of 5 stars (200)
3,752 weekly downloads

Thunderbird Conversations No Restart

This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.

The latest version is compatible with Thunderbird 31+ only (see below for details).

Rated 4 out of 5 stars (381)
3,230 weekly downloads

ReminderFox

ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.

Rated 4 out of 5 stars (486)
3,048 weekly downloads

Saved Password Editor

Adds the ability to create and edit entries in the password manager.

Rated 5 out of 5 stars (189)
2,925 weekly downloads

Clean Links No Restart

Converts obfuscated or nested links to genuine clean links.

Eg: http://somesite.com/?to=www.example.comhttp://www.example.com/

Rated 5 out of 5 stars (74)
2,847 weekly downloads

Manually sort folders

This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.

Rated 4 out of 5 stars (99)
2,749 weekly downloads

ExQuilla for Microsoft Exchange

Thunderbird email accounts, including contacts, connecting to Microsoft Exchange Web Services.

Rated 3 out of 5 stars (79)
2,742 weekly downloads

gTranslate

With gTranslate you can translate any text in a webpage just by selecting and right-clicking over it. The extension uses the Google translation services to translate the text.

Rated 4 out of 5 stars (415)
2,627 weekly downloads

Google Docs Viewer (PDF, DOCX, PPTX, XLSX, etc...)

View publicly-accessible PDF, DOCX, PPTX, XLSX, among other files online with Google Docs by only 2 clicks. Click as usual for your default viewer. Support bookmarked URLs. Security and your explicit viewing intention are always honored.

Rated 4 out of 5 stars (59)
2,476 weekly downloads

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 (139)
2,440 weekly downloads

gContactSync

Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.

Rated 4 out of 5 stars (173)
2,297 weekly downloads

Dr.Web LinkChecker

This plugin allows you to check any file you are about to download, any page you are about to visit with online version of Dr.Web anti-virus.

Rated 4 out of 5 stars (91)
2,276 weekly downloads