# 10ten Japanese Reader (Rikaichamp)

> Quickly translate Japanese by hovering over words. Formerly released as Rikaichamp.

Canonical page: [https://chrome-stats.com/d/10ten-ja-reader](https://chrome-stats.com/d/10ten-ja-reader)

## Overview

- **ID:** `10ten-ja-reader`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Birchill
- **Category:** language-support,social-communication
- **Daily users:** 22,357
- **Weekly downloads:** 164
- **Rating:** 4.75 / 5 (272 ratings)
- **Version:** 1.27.2
- **Last updated:** 2026-05-15
- **First published:** 2017-10-20
- **Size:** 18 MB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/10ten-ja-reader/)
- **Website:** [https://10ten.life](https://10ten.life/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/10ten-ja-reader/privacy/](https://addons.mozilla.org/firefox/addon/10ten-ja-reader/privacy/)

## Description

10ten Japanese Reader (formerly Rikaichamp) is a Chrome extension that allows users to quickly translate Japanese text by simply hovering the mouse pointer over words. It displays dictionary definitions along with pitch accent and kanji stroke order animations to aid language learners.

Key features include automatic dictionary updates twice weekly, support for non-English dictionaries, translation of Japanese yen into other currencies, numbers, era years, unique Japanese measurements, and shogi notation. The extension handles diverse grammatical forms and characters, offers romaji transliteration, and supports vertical text and SVG content. Designed for simplicity, speed, and low memory usage, 10ten Japanese Reader is localized in Japanese and Simplified Chinese, making it a versatile tool for all levels of Japanese learners.

## Rankings

- #476 — Overall
- #20 — Language Support
- #52 — Social & Communication
- #27 — release
- #33 — reader
- #42 — hover

## Permissions and access

### Permissions

- `alarms`
- `clipboardWrite`
- `contextMenus`
- `storage`
- `unlimitedStorage`

### Content script matches

- `*`
- ``
- `docs.google.com`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate 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 medium 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).

## Review summary

Overall, the add-on is widely praised as a valuable learning tool that’s easy to use. Reviewers highlight its hover dictionary and kanji decomposition as key strengths, making it a solid aid for building vocabulary. However, reliability concerns exist for some users, and the lack of a monolingual dictionary is noted. Requests for improvements include copying kana with romaji and adding furigana on hover. Despite these caveats, sentiment across reviews remains positive.

### Pros

- Very useful for learning Japanese and expanding vocabulary.
- Easy to use and user-friendly with straightforward access.
- Strong dictionary features with hover/instant lookup and kanji decomposition.

### Cons

- Occasional reliability issues; at least one reviewer reports it does not work at all.
- Lacks a Japanese monolingual dictionary, which some learners find limiting.
- Users request enhancements such as copying Hiragana/Katakana with romaji and showing furigana on hover.

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Source: [Chrome-Stats](https://chrome-stats.com/d/10ten-ja-reader)