Most Popular Extensions

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GPO support For Firefox and Thunderbird

For work with new versions, use autoconfiguration module https://mozillagpo.sourceforge.io/
Firefox and Thunderbird extension to manage user preferences and user profile CA certificates using group policy

Rated 4 out of 5 stars (13)

510 users

Download for Windows

Easiest YouTube Video Downloader

This Addon simply adds a dropdown button that lets you download YouTube Videos in various Formats. Download YouTube Videos in FLV, 3GP, MP3, MP4, 720p, 1080p in a single click.

Rated 3 out of 5 stars (47)

422 users

Simple Locale Switcher Requires Restart

An easier management of the user interface language

Rated 5 out of 5 stars (14)

413 users

Text2Link Requires Restart

Text2Link is a simple and easy-to-use way to copy the text of a link, or to open URLs and send emails to addresses not marked-up as HTML links.

Rated 4 out of 5 stars (41)

391 users

User Agent Switcher Requires Restart

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Rated 4 out of 5 stars (336)

376 users

Quick Locale Switcher Requires Restart

Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.

Rated 3 out of 5 stars (88)

357 users

Gmail Manager NG Requires Restart

Based on Gmail Manager by Todd Long. This fork is intended to a supported version of Gmail Manager since Todd appears to have gone MIA. Manage multiple Gmail accounts and receive new mail notifications.

Rated 4 out of 5 stars (109)

339 users

Password Exporter

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

Note: This add-on won't work in Firefox 57. It may eventually if the APIs to access passwords are implemented.

Rated 4 out of 5 stars (551)

298 users

SQLite Manager Requires Restart

Manage any SQLite database on your computer.

Rated 4 out of 5 stars (354)

282 users

Complete YouTube Saver Requires Restart

Download YouTube videos in various formats including 1080p, 4K etc (DASH formats). Convert audio track from videos to MP3 or WAV, or save audio in native format (Ogg, AAC/M4A, MP3, OPUS). Save YouTube page, video, comments and subtitles to one folder

Rated 4 out of 5 stars (185)

280 users

Cookies Exterminator

Auto delete cookies, localStorage and IndexedDB objects as soon as they become unused

Rated 5 out of 5 stars (17)

274 users

Spanish (Spain) ChatZilla Requires Restart

Spanish (es-ES) Language Pack for ChatZilla

Rated 5 out of 5 stars (7)

265 users

Download Status Bar

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 (437)

260 users

QuickNote Requires Restart

A simple note-taking extension.

Rated 5 out of 5 stars (204)

225 users

Customizations for Adblock Plus

This extension provides various customization options for the Adblock Plus user interface.

Rated 5 out of 5 stars (15)

203 users

Silent Block

Minimum and fast URL blocker.

Rated 4 out of 5 stars (31)

202 users

CuteButtons

Adds icons to buttons and/or menus.

Rated 4 out of 5 stars (94)

201 users

PlayFlash 32bit Requires Restart

Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.

Rated 5 out of 5 stars (23)

194 users

Download for Windows

Noia Fox options Requires Restart

Options manager and fixes for Noia Fox theme 3.x.x

Rated 4 out of 5 stars (16)

193 users

GameFOX Requires Restart

Enhances the GameFAQs message boards.

Rated 5 out of 5 stars (19)

191 users