Comment Vibe: on-device check

Name: Comment Vibe: on-device check
Author: Kamil Dzieniszewski

See how your comment sounds before you post. Comment Vibe uses Firefox's on-device AI to flag the tone of what you're typing — positive, neutral, negative or toxic, in ~100 languages — right next to the box. 100% private: nothing leaves your browser.

Overview

Firefox Add-ons Store

Daily users

Data as of 2026-07-26

Version:

1.2.5

Last updated: 2026-07-19

Features & Capabilities

Ever hit Post and instantly regretted the tone? Comment Vibe reads your comment as you type and shows you how it sounds — before the internet does.

It runs entirely on your device using Firefox's built-in AI runtime (the experimental WebExtensions AI API, Firefox 134+), and understands comments in ~100 languages. No servers, no account, no data collection.

HOW IT WORKS

Type a comment on LinkedIn, X (Twitter), YouTube, Reddit — any site with a text box. A small badge appears next to the box showing the detected tone. Click the badge to see why: the on-device classifier explains which tone it read, and how confident it is. FOUR CLEAR TONE LABELS 😊 Positive — constructive and friendly 😐 Neutral — balanced and factual 😕 Negative — may come across as harsh or critical 🚫 Toxic — contains aggressive or harmful language

100% PRIVATE, BY DESIGN All analysis happens locally with an on-device multilingual model (about 340 MB, downloaded once from Mozilla/Xenova's model hub — works in English, Polish, and ~100 other languages). Your comments are never sent to any server. No account, no tracking, no analytics — and it keeps working offline once the model is downloaded.

ONE-TIME SETUP Because on-device AI in Firefox is still experimental, you turn it on yourself: • Open the Comment Vibe popup and click "Enable on-device AI" (this grants the optional trialML permission and downloads the model once). • On Firefox 134–139 you may also need to set browser.ml.enable and extensions.ml.enabled to true in about:config (on by default since Firefox 140).

REQUIREMENTS • Firefox 134 or later, on desktop. • Enough free disk/memory for the on-device model.

GOOD TO KNOW This Firefox build focuses on the tone badge and explanation. The kinder-rewrite suggestions and automatic translation available in the Chrome version rely on a generative on-device model that Firefox's AI API does not yet expose — so they are not part of the Firefox build. The tone check itself works the same way.

Comment Vibe is open source. The WebExtensions AI API it depends on is explicitly experimental, so behaviour may change between Firefox versions.

User Growth & Download Statistics

Add-on

By:

Kamil Dzieniszewski

Daily users:

Version:

1.2.5 Last updated: 2026-07-19

Version code:

6363953

Creation date:

2026-07-15

Risk:

Content scripts matches:

<all_urls>

Size:

42.47KB

Email:

ka*****@gmail.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-26

Compare stats and ranking:

Ranking

# 110,423 ▲ 32,096

Other rankings

#58 in device keyword 15 ▲ 74#193 in comment keyword 28 ▲

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Kamil Dzieniszewski

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/comment-vibe-on-device-check/

Email:

ka*****@gmail.com

Website:

https://github.com/dzienisz/comment-vibe/issues

Is Comment Vibe: on-device check Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Comment Vibe: on-device check requires a few 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.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Comment Vibe: on-device check is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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