# lookup

> Fetches definitions from Cambridge Dictionary and Wikipedia. Double click or highlight the word and you will see the definition in the upper right corner with the link provided to the source.

Canonical page: [https://chrome-stats.com/d/lookup](https://chrome-stats.com/d/lookup)

## Overview

- **ID:** `lookup`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Igor M
- **Category:** bookmarks,language-support,social-communication
- **Daily users:** 117
- **Weekly downloads:** 19
- **Rating:** 5.00 / 5 (3 ratings)
- **Version:** 1.0
- **Last updated:** 2025-03-11
- **First published:** 2025-03-10
- **Size:** 13 KB
- **Data as of:** 2026-09-12
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/lookup/)

## Description

This add-on enables instant word definitions by selecting text on a webpage. When you highlight a word, a popup appears with definitions from Cambridge Dictionary, Wikipedia, and the Computer Science Glossary, each with a direct link. If no valid results are found, it remains empty.

## Rankings

- #10,921 — Overall
- #1 — lookup
- #24 — definition
- #160 — wikipedia

## Permissions and access

### Permissions

- `activeTab`
- `https://dictionary.cambridge.org/*`
- `https://en.wikipedia.org/*`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Cambridge Dictionary](https://chrome-stats.com/d/cambridge-dictionary-english) — 62 users, 5.00 / 5
- [Cambridge Dictionary Pop](https://chrome-stats.com/d/cambridge-dictionary-pop) — 239 users, 5.00 / 5
- [Dictionary Glance](https://chrome-stats.com/d/dictionary-glance) — 1 users
- [QuickDefine](https://chrome-stats.com/d/quickdefine) — 2 users
- [Fetch A Word](https://chrome-stats.com/d/fetch-a-word) — 5 users
- [Advanced Dictionary Lookup](https://chrome-stats.com/d/advanced-dictionary-lookup)
- [TheFreeDictionary.com Lookup](https://chrome-stats.com/d/thefreedictionarycom-lookup) — 167 users, 4.56 / 5
- [Wiki Dictionary](https://chrome-stats.com/d/wiki-dictionary) — 4 users
- [wiki-serach](https://chrome-stats.com/d/wiki-serach)
- [Dictionary Anywhere](https://chrome-stats.com/d/look-dictionary-anywhere) — 1 users
- [Wiki Source Search](https://chrome-stats.com/d/wiki-source-search)
- [Cambridge Dictionary](https://chrome-stats.com/d/cambridge-dictionary-toolbar) — 6 users, 5.00 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/lookup)