WHAT

Name: WHAT
Author: YAHYA MANSOUB

By: YAHYA MANSOUB Add-on

Highlight words and instantly view clean dictionary definitions.

Overview

Firefox Add-ons Store

Daily users

Data as of 2026-07-29

Version:

1.0.0

Last updated: 2026-06-06

Features & Capabilities

WHAT is a simple dictionary extension that helps you understand words while browsing.

Highlight a word on any webpage and WHAT can show its definition in a clean popup. You can also use manual mode, where highlighted words are saved and shown only when you open the extension.

Features:

Highlight words to get instant definitions
Choose between automatic popup mode and manual extension mode
Select different dictionary languages
Save words locally for later review
Manage saved word history
Clean yellow knowledge-themed interface
No analytics, ads, or tracking

Saved words and settings are stored locally in your browser. WHAT only sends highlighted words to dictionaryapi.dev when it needs to fetch a definition.

User Growth & Download Statistics

Add-on

By:

YAHYA MANSOUB

Daily users:

Version:

1.0.0 Last updated: 2026-06-06

Version code:

6290937

Creation date:

2026-06-03

Risk:

Permissions:

Host permissions:

https://api.dictionaryapi.dev/*

Content scripts matches:

<all_urls>

Size:

226.44KB

URLs:

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-29

Compare stats and ranking:

Ranking

# 125,483 ▲ 1,290

Other rankings

#180 in definition keyword 25 ▼ 1

For Developers

Monetize with App Pass Boost with Extension Booster

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:

YAHYA MANSOUB

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/what101/

Is WHAT 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.

WHAT 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.

WHAT 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 has low user count. Unpopular extensions may not be stable or safe.
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Medium **** ********* *** ***** ** *** **** * ******* *** ********** *** *** ** ****** ** *****