Language: 简体中文 (Simplified Chinese)
Firefox Language Pack for 简体中文 (zh-CN) – Simplified Chinese
387,736 users
Language: Italiano (Italian)
Firefox Language Pack for Italiano (it) – Italian
379,397 users
Firefox Multi-Account Containers
Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs. Cookies are separated by container, allowing you to use the web with multiple accounts and integrate Mozilla VPN for an extra layer of privacy.
376,083 users
Grammar and Spell Checker - LanguageTool
With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.
352,059 users
Web Threat Shield
Keeps you safe when browsing the web by identifying and blocking dangerous websites.
348,785 users
Ecosia — The search engine that plants trees 🌱
This extension adds Ecosia.org as the default search engine to your browser — it’s completely free!
335,780 users
1Password: Password Manager
The best way to experience 1Password in your browser. Easily sign in to sites, generate passwords, and store secure information, including logins, credit cards, notes, and more.
333,827 users
I don't care about cookies
Get rid of cookie warnings from almost all websites!
329,855 users
Firefox Translations
Translate websites in your browser, privately, without using the cloud. The functionality from this extension is now integrated into Firefox.
326,985 users
Search by Image
A powerful reverse image search tool, with support for various search engines, such as Google, Bing, Yandex, Baidu and TinEye.
315,224 users
Simple Translate
Quickly translate selected or typed text on web pages. Supports Google Translate and DeepL API.
315,128 users
Language: العربية (Arabic)
Firefox Language Pack for العربية (ar) – Arabic
308,816 users
French spelling dictionary
Spelling dictionary for the French language.
308,260 users
NoScript Security Suite
The best security you can get in a web browser! Allow potentially malicious web content to run only from sites you trust. Protect yourself against XSS other web security exploits.
307,519 users
Language: Nederlands (Dutch)
Firefox Language Pack for Nederlands (nl) – Dutch
304,574 users
Language: 日本語 (Japanese)
Firefox Language Pack for 日本語 (ja) – Japanese
302,187 users
Language: Português (PT) (Portuguese)
Firefox Language Pack for Português (PT) (pt-PT) – Portuguese
301,452 users
Norton Password Manager
Norton Password Manager. Free password security you can trust.
290,527 users
Language: Українська (Ukrainian)
Firefox Language Pack for Українська (uk) – Ukrainian
286,254 users
283,434 users
Reddit Enhancement Suite
Reddit Enhancement Suite (RES) is a suite of tools to enhance your Reddit browsing experience.
277,614 users
Russian spellchecking dictionary
Russian spellchecking dictionary
267,636 users
Decentraleyes
Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.
267,054 users
Zoom Extension
Recommended, support FireFox 45+. The Zoom Firefox Extension allows participants to schedule Zoom cloud meetings directly from Google Calendar. you can start an instant meeting or schedule a future meeting via a button.
260,878 users
German Dictionary
German Dictionary (new Orthography) for spellchecking in Firefox
258,084 users