Yomitan

Powerful and versatile pop-up dictionary for language learning used by 60,000+ language learners.
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Yomitan is a powerful and versatile pop-up dictionary widely used by over 60,000 language learners. It supports deciphering texts in more than 20 languages, including Japanese, Spanish, and Arabic, enabling users to tackle difficult vocabulary effectively.

Key features of Yomitan include an interactive popup window for quick dictionary definitions, a dedicated search page for efficient word lookup, and native pronunciation audio playback from multiple sources with support for custom audio. Users can add multiple dictionaries, including slang, kanji, and pronunciation dictionaries, sourced from thousands of online options.

Yomitan also offers automatic flashcard creation compatible with the Anki program via the AnkiConnect plugin, helping users solidify vocabulary learning. The extension works completely offline, ensuring uninterrupted access without an internet connection. It is completely free, open-source, and respects user privacy by not tracking data. For more detailed information, visit Yomitan's website.

Manifest V3 Education Productivity Accessibility
By:
Darius Jahandarie
Daily users:
17,106+ 185
Rating:
4.92
(64) 2 new ratings
Version:
25.4.28.0 Last updated: 2025-05-07
Version code:
5943067
Creation date:
2023-12-08
Risk:
High risk impact Moderate risk likelihood
Permissions:
  • storage
  • clipboardWrite
  • unlimitedStorage
  • declarativeNetRequest
  • scripting
  • contextMenus
Host permissions:
  • <all_urls>
Size:
15.31M
URLs:
Website ,Privacy policy
Full description:
See detailed description
Source:
Firefox Browser Add-ons
Updated:
a day ago

Ranking

# 568 ▼ 4
Other rankings
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User reviews

Users widely praise Yomitan for its superior dictionary capabilities for both English and Japanese, its active development team, and useful new features like Google Docs scanning. It is highly recommended for language learners and considered one of the best addons available. However, several users encounter challenges installing dictionaries and report occasional bugs with word scanning, particularly with specific Japanese characters or compounded words. Some installation issues are also linked to browser workspace configurations, requiring workarounds. Overall, the addon is valued for its powerful functionality despite minor technical issues.
Pros
  • Highly effective English and Japanese dictionary functionality, outperforming other extensions.
  • Strong development and user support community keeping the project active.
  • Helpful in learning Japanese and enhances language comprehension, especially when combined with complementary tools.
  • New features like scanning words on Google Docs are highly appreciated and considered lifesavers.
  • General positive user sentiment, with many stating it is the best addon they have used.
Cons
  • Difficulty installing dictionaries mentioned by multiple users causing frustration.
  • Some bugs or inaccuracies in word scanning, especially with certain Japanese characters and compound words.
  • Issues related to workspace or container settings impacting functionality in certain browsers like Zen browser.
Recent reviews
by Firefox user 18177036, 2025-05-13
by Firefox user 15067341, 2025-05-12
by Hiyo, 2025-05-08
View all user reviews ›

Extension safety

Risk impact

Yomitan 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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  • High ****** ******* *** ********* ********* ******** ***** *** ** ********** ****** * ******** ******* *****
  • Low ****** ***** ** ******* ****** ********** **** ** ** ******** ******* ** **** ***** *************
Risk likelihood

Yomitan is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details
  • High This extension was recently updated in the past month. New updates may not be stable or safe.
  • Medium **** ********* *** ****** **** ****** ********* ********** *** *** ** ****** ** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
Upgrade to see full risk analysis details

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