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

10ten Japanese Reader (Rikaichamp) - Fast Japanese Translation
10ten Japanese Reader (Rikaichamp) is a unique Firefox add-on that instantly translates Japanese words on hover. It offers comprehensive features like pitch accent information, auto-updating of dictionaries, support for non-English dictionaries, translation of Japanese yen amounts, numbers, era years, measurements, and shogi moves. It recognizes a range of grammatical forms and provides localized translations in Japanese and Simplified Chinese. It also offers Kanji data for Kanji kentei, and ensures minimal memory usage for seamless operation.
Add-on stats
Weekly download count: 297
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood:
Manifest version: 2
Permissions:
- alarms
- clipboardWrite
- contextMenus
- storage
- unlimitedStorage
Size: 18.12M
Email: in*****@birchill.co.jp
URLs: Website ,Privacy policy
Ranking
# 473 ▼ 1
Other platforms
Not available on Android
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Add-on summary
Look up Japanese words with the hover of a mouse.
After enabling the add-on from the toolbar (or press Alt+R) simply hover over Japanese text and a popup displays corresponding dictionary definitions.
Features:
- Pitch accent information
- Automatically updating dictionaries (updating twice a week)
- Support for non-English dictionaries
- Translation of
- Japanese yen amounts (e.g. 30億円) into another currency,
- Japanese numbers (e.g. 13億5千万 into 1,350,000,000),
- Japanese-era years (e.g. 昭和56年、令和元年),
- 畳/帖 measurements (e.g. 四畳半、12.6 帖),
- shogi moves (e.g. ☗8三銀引成)
- Recognition of a wide range of grammatical forms (e.g. 兼した, 食べてた, 分からん、じーちゃん、頑張ろー、そーゆー, 買っとく etc.)
- Automatic preview of name entries
- Handling of a wide range of characters (e.g. ㌀, ㋿, 𠏹沢, 8月, B級グルメ, オーサカ)
- Localized into Japanese (so you can study Japanese while you study Japanese!) and Simplified Chinese
- Romaji transliteration
- Copy to clipboard in various formats
- Support for the widest range of Web content (vertical text, SVG images, hidden text etc.)
- Minimal memory usage
- Kanji data for Kanji kentei, Conning references, updated educational levels, heavily reworked kanji components etc.
Twitter: @10tenstudy
User reviews
Pros
- Helps in learning Japanese effectively
- Easy to use and works well right after installation
- Incredible for immersion reading and also useful for other languages like Chinese
- Includes features like Japanese accent pronunciation and WaniKani/BunPro integration
Cons
- Occasional bugs with the add-on not turning on or requiring multiple clicks
- User interface issues related to bundled font changes and consistency with system fonts
- Difficulty in finding specific homonyms or words in the lookup results
Most mentioned
- Bugs related to activation requiring multiple clicks
- Feature suggestions like displaying furigana
- Font display issues affecting user experience
User reviews
by Beck, 2025-02-07
by himihuna, 2025-02-03
I dont remember ever encountering UX breaking bugs on 10ten, nor the previous rikaichamp or the older rikaichan
by uneliasmarsu, 2025-01-11
Add-on safety
Risk impact
10ten Japanese Reader (Rikaichamp) requires some sensitive permissions that could impact your browser and data security. 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
10ten Japanese Reader (Rikaichamp) is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
- Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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