Language: 简体中文 (Simplified Chinese)
Firefox Language Pack for 简体中文 (zh-CN) – Simplified Chinese
351,752 users
Language: Italiano (Italian)
Firefox Language Pack for Italiano (it) – Italian
347,647 users
Language: Español (CL) (Spanish, Chile)
Firefox Language Pack for Español (CL) (es-CL) – Spanish, Chile
346,488 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.
340,800 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.
325,016 users
Web Threat Shield
Keeps you safe when browsing the web by identifying and blocking dangerous websites.
324,022 users
I don't care about cookies
Get rid of cookie warnings from almost all websites!
316,250 users
Firefox Translations
Translate websites in your browser, privately, without using the cloud. The functionality from this extension is now integrated into Firefox.
315,563 users
Search by Image
A powerful reverse image search tool, with support for various search engines, such as Google, Bing, Yandex, Baidu and TinEye.
314,181 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!
312,335 users
Simple Translate
Quickly translate selected or typed text on web pages. Supports Google Translate and DeepL API.
309,566 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.
302,018 users
Language: العربية (Arabic)
Firefox Language Pack for العربية (ar) – Arabic
297,923 users
French spelling dictionary
Spelling dictionary for the French language.
292,135 users
Language: Nederlands (Dutch)
Firefox Language Pack for Nederlands (nl) – Dutch
286,095 users
Language: 日本語 (Japanese)
Firefox Language Pack for 日本語 (ja) – Japanese
282,662 users
Norton Password Manager
Norton Password Manager. Free password security you can trust.
276,951 users
Language: Português (PT) (Portuguese)
Firefox Language Pack for Português (PT) (pt-PT) – Portuguese
276,263 users
Reddit Enhancement Suite
Reddit Enhancement Suite (RES) is a suite of tools to enhance your Reddit browsing experience.
275,574 users
Russian spellchecking dictionary
Russian spellchecking dictionary
265,945 users
264,109 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.
263,371 users
Language: Українська (Ukrainian)
Firefox Language Pack for Українська (uk) – Ukrainian
259,700 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.
252,865 users
German Dictionary
German Dictionary (new Orthography) for spellchecking in Firefox
240,746 users