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: 747,883
-11,324
Version: 8.929.0 (Last updated: 2025-03-07)
Version code: 5899530
Creation date: 2014-12-17
Weekly download count: 2,820
Firefox on Android: No
Permissions:
  • http://*/*
  • https://*/*
  • tabs
  • notifications
  • cookies
  • storage
Size: 39.82M
Full description: See detailed description
Updated: a day ago

Other platforms

Grammarly: AI Writing and Grammar Checker App (v14.1228.0)
46,000,000 4.51 (42,673)
Grammarly-AI Writing Assistant (v2.78.51157)
51,696,761 3.92 (245,153)

User reviews

Pros
  • Helpful built-in proofreader
  • Assists with expressing feelings clearly
  • Provides value with AI support
Cons
  • Turns off by itself
  • Lack of instructions
  • Requires signup for advertising commercial
Most mentioned
  • Turns off by itself
  • Helpful proofreader
  • AI assistance in writing
These summaries are automatically generated weekly using AI based on recent user reviews. User reviews may be inaccurate, spammy, or outdated.
User reviews
by john, 2025-03-22


by Eljoj, 2025-03-20
View all user reviews

Add-on safety

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

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

Risk likelihood analysis details
  • High This extension was recently updated in the past month. 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: