SmartSpell

Name: SmartSpell
Author: John

Fast, private better spell checking for Firefox with contextual suggestions, red squiggles, and right-click corrections. Runs locally in your browser.

Overview

Firefox Add-ons Store

Daily users

3 ▲ 2

Data as of 2026-09-03

Version:

3.4.0

Last updated: 2026-08-25

Features & Capabilities

Smart Spell replaces basic dictionary-only spell checking with faster, context-aware spelling correction directly inside Firefox.

Features:

Red wavy underlines for likely misspellings Right-click correction suggestions Context-aware ranking using word and bigram frequency data Works in text fields and contenteditable editors across websites Add words to a personal Smart Dictionary Runs entirely locally No typed text is sent to Google or any other external service No analytics, tracking, advertising, or account required

Smart Spell uses English frequency data derived from the SymSpell project. The included frequency dictionary combines Google Books Ngram frequency information with SCOWL English vocabulary data.

Smart Spell is currently designed for desktop Firefox.

User Growth & Download Statistics

Add-on

By:

John

Daily users:

3 2

Version:

3.4.0 Last updated: 2026-08-25

Version code:

6435922

Creation date:

2026-08-10

Firefox add-on GUID:

smart-spell@local

Firefox add-on numeric ID:

3052068

Weekly download count:

Firefox on Android:

Risk:

Permissions:

storage
menus
<all_urls>

Content scripts matches:

<all_urls>

Size:

2.50MB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-09-03

Compare stats and ranking:

Ranking

# 57,142 ▲ 70,744

Other rankings

#139 in smart tool keyword 8 ▲ 102#142 in smartbook keyword 1 ▲ 86#159 in smart keyword 40 ▲ #172 in smartphone keyword 2 ▲ #230 in spelling keyword 22 ▲

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:

John

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/smartspell/

Is SmartSpell 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.

SmartSpell 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.

SmartSpell 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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