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

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Yomitan

Learning a new language? Yomitan is the ideal dictionary companion.
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Extensions are like apps for Firefox.

They add features to Firefox to make browsing faster, safer, or just plain fun.
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2025 Staff Picks
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New Recommended Extensions
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Extension Starter Pack
Extension Starter Pack
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Tab managers
  • Tree Style Tab

    Tree Style Tab

    Show tabs like a tree.

    162,068 users

  • OneTab

    OneTab

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

    158,817 users

  • Tab Session Manager

    Tab Session Manager

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

    146,307 users

  • Auto Tab Discard

    Auto Tab Discard

    Increase browser speed and reduce memory load and when you have numerous open tabs.

    74,540 users

Social media extensions
  • Return YouTube Dislike

    Return YouTube Dislike

    Returns ability to see dislike statistics on youtube

    894,600 users

  • BetterTTV

    BetterTTV

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

    482,908 users

  • Sink It for Reddit

    Sink It for Reddit

    Upgrade your Reddit experience with color coded comments, easier nav, sub-reddit blocking, gestures for upvoting, ad+nag blocking, and more. It's like RES, for mobile!

    12,164 users

  • Control Panel for Twitter

    Control Panel for Twitter

    Gives you more control over Twitter and adds missing features and UI improvements

    44,550 users

Accessibility extensions
  • Dark Reader

    Dark Reader

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

    1,255,055 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.

    197,256 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.

    44,629 users

  • Sidebery

    Sidebery

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

    56,320 users

“scholar” tagged extensions
  • Web Archives

    Web Archives

    View archived and cached versions of web pages on various search engines, such as the Wayback Machine and Archive․is.

    66,005 users

  • Notefox: websites notes

    Notefox: websites notes

    Take notes on every website in a smart and simple way!

    12,370 users

  • Power Thesaurus

    Power Thesaurus

    Use the power of synonyms by button in toolbar, right-click or by word selection on any page.

    9,023 users

  • Google Scholar Button

    Google Scholar Button

    Lookup scholarly articles as you browse the web.

    91,478 users