# Grammarly: AI Writing and Grammar Checker App

> From blank page to polished draft, Grammarly’s AI helps you write faster and stronger. Get real-time grammar fixes, tone transformations, and instant content generation right where you write in Firefox.

Canonical page: [https://chrome-stats.com/d/grammarly-1](https://chrome-stats.com/d/grammarly-1)

## Overview

- **ID:** `grammarly-1`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Grammarly
- **Category:** language-support,social-communication
- **Daily users:** 526,881
- **Weekly downloads:** 2,293
- **Rating:** 4.09 / 5 (3,215 ratings)
- **Version:** 8.937.0
- **Last updated:** 2026-04-24
- **First published:** 2014-12-17
- **Size:** 41 MB
- **Data as of:** 2026-09-12
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/grammarly-1/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/grammarly-1/privacy/](https://addons.mozilla.org/firefox/addon/grammarly-1/privacy/)

## Description

Grammarly for Firefox is an always-on AI writing assistant that helps you write faster and with greater confidence. It provides real-time grammar, spelling, and punctuation corrections, suggests clarity and tone improvements, and can generate one-click drafts to overcome writer’s block. Integrated directly into your browser, Grammarly works across Google Docs, Gmail, LinkedIn, and hundreds of thousands of other sites so you can improve text wherever you write.

Free users get essential grammar and clarity suggestions plus basic AI drafting and auto-citations, while Pro users unlock advanced sentence rewrites, tone and formality control, audience insights, plagiarism detection, and team style features. Backed by privacy and trust commitments, Grammarly also offers desktop apps and a dedicated Docs writing surface for deeper composition and strategic feedback.

## Rankings

- #30 — Overall
- #8 — Language Support
- #16 — Social & Communication
- #1 — ai grammar
- #1 — ai grammar check
- #1 — ai grammar checker

## Permissions and access

### Permissions

- `http://*/*`
- `https://*/*`
- `tabs`
- `notifications`
- `cookies`
- `identity`
- `storage`

### Content script matches

- `<all_urls>`
- `*.atlassian.net`
- `mail.google.com`
- `*.mail.google.com`
- `quora.com`
- `*.quora.com`
- `*.slack.com`
- `*.blackboard.com`
- `*.blogger.com`
- `publish.buffer.com`
- `*.publish.buffer.com`
- `facebook.com`
- `*.facebook.com`
- `calendar.google.com`
- `*.calendar.google.com`
- `keep.google.com`
- `*.keep.google.com`
- `intercom.io`
- `*.intercom.io`
- `linkedin.com`
- `*.linkedin.com`
- `medium.com`
- `*.medium.com`
- `messenger.com`
- `*.messenger.com`
- `teams.microsoft.com`
- `*.teams.microsoft.com`
- `translate.google.com`
- `*.translate.google.com`
- `reddit.com`
- `*.reddit.com`
- `youtube.com`
- `*.youtube.com`
- `twitter.com`
- `*.twitter.com`
- `x.com`
- `*.x.com`
- `*.lightning.force.com`
- `trello.com`
- `*.trello.com`
- `upwork.com`
- `*.upwork.com`
- `web.whatsapp.com`
- `*.web.whatsapp.com`
- `wix.com`
- `*.wix.com`
- `wordpress.com`
- `*.wordpress.com`
- `*.zendesk.com`
- `wattpad.com`
- `*.wattpad.com`
- `onlinechatdashboard.com`
- `*.onlinechatdashboard.com`
- `wordcounter.net`
- `*.wordcounter.net`
- `fiverr.com`
- `*.fiverr.com`
- `educationperfect.com`
- `*.educationperfect.com`
- `apclassroom.collegeboard.org`
- `*.apclassroom.collegeboard.org`
- `studio.youtube.com`
- `*.studio.youtube.com`
- `chat.google.com`
- `*.chat.google.com`
- `twitch.tv`
- `*.twitch.tv`
- `papago.naver.com`
- `*.papago.naver.com`
- `readworks.org`
- `*.readworks.org`
- `app.nearpod.com`
- `*.app.nearpod.com`
- `mail.aol.com`
- `*.mail.aol.com`
- `github.com`
- `*.github.com`
- `coursera.org`
- `*.coursera.org`
- `commonlit.org`
- `*.commonlit.org`
- `classroom.google.com`
- `*.classroom.google.com`
- `app.seesaw.me`
- `*.app.seesaw.me`
- `forms.office.com`
- `*.forms.office.com`
- `outlook.live.com`
- `*.outlook.live.com`
- `outlook.office.com`
- `*.outlook.office.com`
- `docs.google.com`
- `*.overleaf.com`

## Safety

- **Risk impact:** Very high risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension was updated more than 6 months ago. Older versions are more likely to be stable and safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

Users note solid basic grammar corrections and daily-writing usefulness, but the extension is hampered by recurring issues: you must sign in to use it, there are privacy concerns and data-collection practices, AI-driven features can worsen suggestions and push upgrades, and reliability problems like UI freezes or slow loading.

### Pros

- Core grammar corrections remain helpful for simple edits.
- Useful for daily writing and general writing tasks.
- Overall extension is good/useful despite issues.

### Cons

- Sign-in requirements and frequent login prompts create friction.
- Privacy concerns and data collection on websites.
- AI features degrade accuracy and come with upgrade/nagging prompts.
- Reliability and performance issues, including UI freezing and slow loading.

## Similar extensions and apps

- [Pencilo: AI Writing Assistant](https://chrome-stats.com/d/pencilo-ai-writing-assistant)
- [Grammar Checker and Text Rewriter — Linguix](https://chrome-stats.com/d/linguix) — 402 users, 3.93 / 5
- [AI Writing Assistant](https://chrome-stats.com/d/ai-writing-assistant) — 1 users
- [Wordtune: AI Writing, Paraphrasing & Grammar Tool](https://chrome-stats.com/d/wordtune-ai-writing-assistant) — 1,346 users, 3.43 / 5
- [Trinka AI for Firefox](https://chrome-stats.com/d/trinka-ai) — 33 users, 5.00 / 5
- [Trinka AI for Firefox](https://chrome-stats.com/d/trinka-ai-for-firefox-browser)
- [Grmmr](https://chrome-stats.com/d/grmmr)
- [AI Grammer Checking by SpellFast](https://chrome-stats.com/d/spellfast-ai) — 32 users, 3.00 / 5
- [Trinka AI](https://chrome-stats.com/d/trinka-ai-firefox-browser) — 228 users, 3.75 / 5
- [ProWritingAid](https://chrome-stats.com/d/prowritingaid) — 2,382 users, 3.24 / 5
- [Grammar Checker-Multilingual](https://chrome-stats.com/d/grammar-checker-multilingual) — 1 users
- [Language Improver](https://chrome-stats.com/d/language-improver) — 5 users

---

Source: [Chrome-Stats](https://chrome-stats.com/d/grammarly-1)