# VocabRadar

> Find your own new words: YouTube/Bilibili videos, any web page, plus AI chat. No sign-up. One glance, one new word.

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

## Overview

- **ID:** `vocabradar`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** VocabRadar.com
- **Category:** language-support
- **Version:** 0.3.2
- **Last updated:** 2026-09-09
- **First published:** 2026-09-04
- **Size:** 8.73 MB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/vocabradar/)
- **Website:** [http://vocabradar.com](http://vocabradar.com/)

## Description

VocabRadar — discover your own new words in the content you were going to watch
or read anyway.

[Learn words from videos]
· On Bilibili / YouTube video pages, a side panel shows the subtitle list with
  your new words highlighted, plus a word list for the video.
· Subtitles can be overlaid on the video with highlights and inline translations.
· Notes switch between compact (word + gloss) and detailed (headword, full
  senses, word-list tags, frequency band).
· Click a subtitle timestamp to jump straight to that line.
· One click copies the annotated subtitles to the comment box, or exports your
  word list.

[Learn words from the web]
· On any web page: new words highlighted in the body text, side annotations,
  hover definitions, right-click lookup.
· The in-page sidebar collects the page's new words with their sentences.

[Learn even without subtitles]
· Built-in local speech recognition (Whisper) turns subtitle-less videos,
  recordings, or uploaded audio/video into learnable text.
· OCR reads text in the current video frame (burned-in subtitles, slides).

[AI chat]
· A built-in chat window works with free built-in models, or fill in your own
  OpenAI / Anthropic-compatible key.

[Why "your own new words"]
· Words are flagged by frequency threshold: common words stay quiet, rare words
  get flagged. You tune the threshold.
· Word-frequency and word-list data ship inside the extension — lookups need no
  account and never upload your browsing history.

No sign-up, no account. Install and learn.

## Rankings

- #146,711 — Overall
- #103 — radar

## Permissions and access

### Permissions

- `storage`
- `alarms`
- `activeTab`
- `cookies`
- `contextMenus`
- `scripting`

### Host permissions

- `*://*.bilibili.com/*`
- `*://*.youtube.com/*`
- `<all_urls>`

### Content script matches

- `*.bilibili.com`
- `*.youtube.com`
- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High 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 was recently updated in the past month. New updates 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).

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