Right-click a section of text and click the Translate icon next to it to text translate or listen to it in your language.

Reddit Enhancement Suite (RES) is a suite of tools to enhance your Reddit browsing experience.

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

A global dark theme for the web

Save anything on the web to OneNote. Clip it to OneNote, organize and edit it, then access it from any device.

Get free text of research papers as you browse, using Unpaywall's index of ten million legal, open-access articles.

View archived and cached versions of web pages on 10+ search engines, such as the Wayback Machine, Archive․is, Google, Bing and Yandex

Listen to live radio stations from around the world!

Multiple account (or label) Gmail notifier (without storing passwords)

Tranquility Reader improves the readability of web articles by removing unnecessary elements like ads, images, social sharing widgets, and other distracting fluff.

Displays a sidebar that lets you take notes on web pages.

Welcome to the Official Internet Archive Wayback Machine Browser Extension! Go back in time to see how a website has changed through the history of the Web. Save websites, view missing 404 Not Found pages, or read archived books & papers.

Get international weather updates (via AccuWeather.com) displayed right in Firefox with this highly customizable extension.

The best way to see the weather right in your browser. Easier than looking outside!

Select a number of links with a rectangle and open them in new tabs. You can also lasso checkboxes to quickly check or uncheck them. Works with radio buttons as well.

Easily print any page to PDF with just one click!

The best way to group your subscriptions
Using this simple extension you can create collections that seamlessly fit into YouTube's layout.

Enable Bing Chat for All Browsers!

Save frequently-entered text for pasting later.

Get auto-updated RSS feed bookmark folders.

Easily open desired links in PDF viewer

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, and more

Social Fixer for Facebook fixes annoyances, adds features, and enhances existing functionality to make FB more fun and efficient. Filter the news feed, hide sponsored posts and political posts, hide parts of the page you don't want to see, and more!

Improve your experience on TweetDeck web with emojis, thumbnails, and a lot of customization options to make TweetDeck even better for you

Classic dark theme for Vkontakte. Switch VK to dark mode and back in one click.

Fastest Youtube video downloader, convert youtube to mp3 with just 1 click

Find yourself spending too much time on Facebook? Eradicate distractions by replacing your entire news feed with an inspiring quote

MAL-Sync enables automatic episode tracking between MyAnimeList/Anilist/Kitsu/Simkl and multiple anime streaming websites.

Puts an RSS/Atom subscribe button back in URL bar.

Supports "Live Bookmarks" (built-in), Feedly, & Inoreader

Monitors web pages for updates. Useful for websites that don't provide Atom or RSS feeds.