Language: Italiano (Italian)
Firefox Language Pack for Italiano (it) – Italian
355,631 users
Language: 简体中文 (Simplified Chinese)
Firefox Language Pack for 简体中文 (zh-CN) – Simplified Chinese
351,942 users
Language: Español (CL) (Spanish, Chile)
Firefox Language Pack for Español (CL) (es-CL) – Spanish, Chile
349,122 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.
341,220 users
Web Threat Shield
Keeps you safe when browsing the web by identifying and blocking dangerous websites.
327,911 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.
326,428 users
I don't care about cookies
Get rid of cookie warnings from almost all websites!
315,993 users
Firefox Translations
Translate websites in your browser, privately, without using the cloud. The functionality from this extension is now integrated into Firefox.
315,221 users
Search by Image
A powerful reverse image search tool, with support for various search engines, such as Google, Bing, Yandex, Baidu and TinEye.
314,776 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!
312,928 users
Simple Translate
Quickly translate selected or typed text on web pages. Supports Google Translate and DeepL API.
310,563 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.
302,144 users
Language: العربية (Arabic)
Firefox Language Pack for العربية (ar) – Arabic
301,111 users
French spelling dictionary
Spelling dictionary for the French language.
286,918 users
Language: Nederlands (Dutch)
Firefox Language Pack for Nederlands (nl) – Dutch
285,965 users
Language: 日本語 (Japanese)
Firefox Language Pack for 日本語 (ja) – Japanese
283,121 users
Norton Password Manager
Norton Password Manager. Free password security you can trust.
277,810 users
Language: Português (PT) (Portuguese)
Firefox Language Pack for Português (PT) (pt-PT) – Portuguese
277,627 users
Reddit Enhancement Suite
Reddit Enhancement Suite (RES) is a suite of tools to enhance your Reddit browsing experience.
276,004 users
Russian spellchecking dictionary
Russian spellchecking dictionary
267,934 users
265,153 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.
263,558 users
Language: Українська (Ukrainian)
Firefox Language Pack for Українська (uk) – Ukrainian
260,670 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.
253,570 users
Cookie AutoDelete
Control your cookies! This WebExtension is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Keep the ones you trust (forever/until restart) while deleting the rest. Containers Supported
241,822 users