Extensions by Weekly Downloads

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JavaScript Debugger

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

Rated 4 out of 5 stars (50)
5,774 weekly downloads

Enigmail Featured

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

Rated 4 out of 5 stars (192)
5,369 weekly downloads

Adblock Edge No Restart

Adblock Edge is a fork of the Adblock Plus version 2.1.2 extension for blocking advertisements on the web, without sponsored ads whitelist.

**This addon has been discontinued**

Rated 5 out of 5 stars (307)
4,553 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 (1,174)
3,870 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 (109)
3,781 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 (219)
3,572 weekly downloads

MinimizeToTray revived

Minimizes windows into the system tray.

Rated 4 out of 5 stars (324)
3,497 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 (1,686)
3,416 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 (527)
3,391 weekly downloads

Forecastfox (fix version)

Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.

Now Available for: Firefox, Thunderbird and SeaMonkey!

Rated 5 out of 5 stars (201)
3,220 weekly downloads

Image Zoom

Adds zoom and rotation functionality for images...

Rated 4 out of 5 stars (340)
3,027 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 (225)
2,997 weekly downloads

QuickNote

A simple note-taking extension.

Rated 5 out of 5 stars (172)
2,691 weekly downloads

LookOut

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 (150)
2,678 weekly downloads

Website to PDF

Convert the current webpage into a PDF file!

Just for now - get also a PRO version for FREE!

Rated 1 out of 5 stars (1)
2,595 weekly downloads

Add-ons Manager Context Menu

Add more items to Add-ons Manager context menu.

Rated 5 out of 5 stars (35)
2,568 weekly downloads

Clippings

Save frequently-entered text for pasting later.

Rated 4 out of 5 stars (180)
2,547 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 (124)
2,504 weekly downloads

Menu Wizard

Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (177)
2,401 weekly downloads

Saved Password Editor

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

Rated 5 out of 5 stars (227)
2,377 weekly downloads