Most Popular Extensions


Adblock Plus No Restart Featured

Blocks annoying video ads on YouTube, Facebook ads, banners and much more.

Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Rated 5 out of 5 stars (4,987)
21,495,031 users

Lightning Featured

Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.

Rated 3 out of 5 stars (1,883)
5,556,686 users

FlashGot Mass Downloader

Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.

Rated 5 out of 5 stars (504)
932,807 users

Element Hiding Helper for Adblock Plus No Restart

Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.

Rated 5 out of 5 stars (451)
750,116 users

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 (302)
664,063 users


Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.

Rated 4 out of 5 stars (763)
653,834 users

uBlock Origin No Restart

Finally, an efficient blocker. Easy on CPU and memory.

Rated 5 out of 5 stars (310)
559,438 users

Personas Plus

Personas are free, easy-to-install "skins" for Firefox. Personas Plus extends that built-in functionality to give you even more control and easier access to new, popular, and your own favorite Personas.

Rated 3 out of 5 stars (956)
367,535 users


Adds some tools to import and export folders and messages

Rated 4 out of 5 stars (127)
331,103 users

S3.Google Translator

S3.Google Translator adds the power of Google Translate’s automatic translations to your browser!
It supports translation of selected text, entered phrase or whole webpage between any of 80+ languages.

New Feature: Language learning!

Rated 5 out of 5 stars (255)
330,009 users

Provider for Google Calendar

Allows bidirectional access to Google Calendar

Rated 4 out of 5 stars (1,033)
313,129 users

FoxyProxy Standard

FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.

Rated 4 out of 5 stars (346)
297,197 users

Full Web Page Screenshots (♥♥♥♥♥)

FireShot makes full web page screenshots. Demo:

Screenshots can be quickly captured and:

― Saved as Image or PDF
― Sent to clipboard
― Printed
― Annotated *
― Uploaded *
― E-Mailed *

* OS Windows only

Rated 5 out of 5 stars (439)
265,641 users

Download Status Bar No Restart

If you are the kind of person who likes to have total control over every aspect of your downloads, "Download Status Bar" is the add-on you are looking for.

Rated 5 out of 5 stars (339)
247,817 users

MinimizeToTray revived

Minimizes windows into the system tray.

Rated 4 out of 5 stars (313)
240,435 users

SQLite Manager

Manage any SQLite database on your computer.

Rated 5 out of 5 stars (40)
199,849 users

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 (147)
197,800 users

Password Exporter No Restart

This extension allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.

Rated 4 out of 5 stars (325)
188,116 users

Image Zoom Featured

Adds zoom and rotation functionality for images...

Rated 4 out of 5 stars (334)
166,232 users

Enigmail Featured

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

Rated 4 out of 5 stars (183)
161,636 users