Grammarly: AI Writing and Grammar Checker App

Improve your writing with Grammarly's AI assistance. Get spell check, grammar check, generative AI, and more in one tool. Real-time suggestions for improving tone and clarity help ensure your writing makes the impression you want.

Grammarly for Firefox

Grammarly is your AI-powered writing assistant that offers real-time suggestions to enhance your online writing. Whether drafting emails, documents, or social media posts, Grammarly provides comprehensive feedback on spelling, grammar, punctuation, and clarity. With its advanced features, including generative AI for instant drafts and tone adjustments, you’ll communicate your ideas more effectively.

Grammarly goes beyond standard proofreading with contextual writing enhancements, ensuring your work is polished and professional. Available in a free version with essential checks and a Pro version for advanced writing support, Grammarly seamlessly integrates with your browser for hassle-free use in Google Docs, email, and beyond. Trusted by millions, it's the ideal tool for students, professionals, and anyone seeking to elevate their writing skills.

Manifest V2
By:
Grammarly
Daily users:
714,955+ -9,656
Version:
8.929.0 (Last updated: 2025-03-07)
Version code:
5899530
Creation date:
2014-12-17
Permissions:
  • http://*/*
  • https://*/*
  • tabs
  • notifications
  • cookies
  • storage
Size:
39.82M
Full description:
See detailed description
Updated:
13 hours ago

Other platforms

Grammarly: AI Writing and Grammar Checker App (v14.1231.0)
47,000,000+ 4.51 (42,687)
Grammarly-AI Writing Assistant (v2.79.51415)
51,882,859+ 3.94 (245,933)

User reviews

Pros
  • Accurate corrections for grammar, spelling, and punctuation
  • Offers style enhancements for clarity and tone
  • Seamless integration with popular web platforms
  • Customizable language preferences and personal dictionaries
  • Robust free version available
Cons
  • Premium subscription required for advanced features
  • Frequent sign-in issues and unreliable functionality
  • Occasional slowdowns on complex web forms
  • Extension turns off by itself
  • Lack of clear instructions for troubleshooting
Most mentioned
  • Sign-in issues and prompts to create an account
  • Unreliable functionality and app performance
  • Need for premium features for full functionality
These summaries are automatically generated weekly using AI based on recent user reviews. User reviews may be inaccurate, spammy, or outdated.
User reviews
by Diane, 2025-04-12


View all user reviews

Add-on safety

Risk impact
Very high risk impact

Grammarly: AI Writing and Grammar Checker App requires a lot of sensitive permissions. Exercise caution before installing.

Risk impact analysis details
  • Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
  • Critical ****** ****** ** ******* ***** ***** *** ** **** ** ***** **** ******** ****** *** ******** ********** * ******* ********
  • Critical ******* ****** ** *** ********* ******** ************** *********** ********** ********** *************** ************ *********** ************* ************ ************* *********** ************** ************** *********** ************ ************ ****** ********** *********** *********** ************* ******** ************** ************ ************ ************************ **************** *********** ********************* ***************** ********** ********** ************** ************ ******** *********** ************* ************** ********** *********** ********* ************
  • High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
  • Medium ******* ******* ************* ***** *** ** ******* *** **** ******* ****** ******** *******
Risk likelihood
Low risk likelihood

Grammarly: AI Writing and Grammar Checker App has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details
  • Medium This extension was updated in the past 3 months. New updates may not be stable or safe.
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** **** **** ****** ******* ********** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
Upgrade to see full risk analysis details

Similar add-ons

Here are some Firefox add-ons that are similar to Grammarly: AI Writing and Grammar Checker App:

GrammFix: AI Writer Helper GrammFix: AI Writer Helper
Intovation
11 5.00 (1)
Grammar Checker Grammar Checker
Content Arcade
7 0.00 (0)
AI Grammer Checking by SpellFast AI Grammer Checking by SpellFast
SpellFast AI Founder
3 5.00 (1)
Grammar.com Grammar.com
STANDS4
230 3.30 (10)
Grammar Checker Grammar Checker
789Club
3 0.00 (0)
Typeright: Grammar & Spelling Checker Typeright: Grammar & Spelling Checker
iTranslate
156 4.33 (6)
Grammar and Style Checker Grammar and Style Checker
DbdIv
- 0.00 (0)