To use these add-ons, you'll need to download Firefox.

Log in
BY FIREFOX

Firefox Translations

Translate websites in Firefox — privately — without using the cloud.
Get the extension

Extensions are like apps for Firefox.

They add features to Firefox to make browsing faster, safer, or just plain fun.
See all extensions
Extension Starter Pack
Extension Starter Pack
See staff picks
Privacy & Security
Privacy & Security
See staff picks
Twitch customization
Twitch customization
See staff picks
Recommended extensions
  • Dark Background and Light Text

    Dark Background and Light Text

    Make every web page (or just the pages you want) display light text on dark backgrounds. All color variations are fully customizable.

    Mikhail Khvoinitsky

    30,569 users

  • Undo Close Tab

    Undo Close Tab

    Allows you to restore the tab you just closed with a single click—plus it can offer a list of recently closed tabs within a convenient context menu.

    Manuel Reimer

    43,250 users

  • Swift Selection Search

    Swift Selection Search

    Swiftly access your search engines in a popup panel when you select text in a webpage. Context menu also included!

    Daniel Lobo

    10,312 users

  • Show Video Controls for Firefox

    Show Video Controls for Firefox

    Automatically enables video controls when playing html webm videos.

    CoreBoolean

    2,128 users

Popular themes
Tab managers
  • Tree Style Tab

    Tree Style Tab

    Show tabs like a tree.

    Piro (piro_or)

    171,630 users

  • OneTab

    OneTab

    OneTab - Too many tabs? Convert tabs to a list and reduce browser memory

    OneTab Team

    161,023 users

  • Tab Session Manager

    Tab Session Manager

    Save and restore the state of windows and tabs. It also supports automatic saving and cloud sync.

    sienori

    148,115 users

  • New Tab Override

    New Tab Override

    New Tab Override allows you to set the page that shows whenever you open a new tab.

    Sören Hentzschel

    60,485 users

Social media extensions
  • Return YouTube Dislike

    Return YouTube Dislike

    Returns ability to see dislike statistics on youtube

    Dmitry Selivanov

    908,791 users

  • YouTube Search Fixer

    YouTube Search Fixer

    Remove ALL distracting search results, redirect shorts back to legacy page and try little visual changes suited for low resolution screens.

    Phoenix

    30,936 users

  • BetterTTV

    BetterTTV

    Enhances Twitch and YouTube with new features, emotes, and more.

    NightDev

    495,177 users

  • Augmented Steam

    Augmented Steam

    Augments your Steam Experience

    IsThereAnyDeal

    61,768 users

Recommended themes
Accessibility extensions
  • Dark Reader

    Dark Reader

    Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing.

    Dark Reader Ltd

    1,267,683 users

  • Read Aloud: A Text to Speech Voice Reader

    Read Aloud: A Text to Speech Voice Reader

    Read out loud the current web-page article with one click. Supports 40+ languages.

    LSD Software

    200,287 users

  • Dark Mode

    Dark Mode

    Dark theme and night shift mode for every website. Care your eyes, use Dark Mode for night and daily web browsing.

    Dark Mode

    42,292 users

  • Sidebery

    Sidebery

    Vertical tabs tree and bookmarks in sidebar with advanced containers configuration, grouping and many other features.

    mbnuqw

    59,200 users

“video downloader” tagged extensions
  • Video DownloadHelper

    Video DownloadHelper

    Download videos from the web. Easy, smart, no tracking.

    Paul

    1,763,163 users

  • Easy Youtube Video Downloader Express

    Easy Youtube Video Downloader Express

    A simple extension for superfast and easy YouTube downloads in FLV, 3GP, MP3, MP4, 720p, and 1080p formats.

    Dishita

    379,152 users

  • Download Video and Flash - HD Download

    Download Video and Flash - HD Download

    Download Video and Flash - HD Download is a great download helper tool that lets you download video and Flash games very easily. Download from YouTube, Facebook, Dailymotion, Vimeo and more. Download and enjoy! Download now!

    Download Flash and Video Team

    53,321 users

  • YouTube mp3

    YouTube mp3

    The YouTube-mp3 Add-on generates a "MP3" button on YouTube. Convert YouTube to mp3 and download the file to your device.

    Addon Developer

    32,071 users

Change the way Firefox looks with themes.

Change the way Firefox looks with themes.