Mouse Dictionary

Mouse Dictionary

Super fast dictionary

What is Mouse Dictionary?
Mouse Dictionary is a Firefox add-on aiming to expedite language translation tasks. Exquisitely designed for English-Japanese, Japanese-English, and English-English language pairs, it also supports other language pair functionalities. The Add-on stands out with its swift responses, bespoke phrase detection, data import capabilities, and customized view options. Its use isn't confined to HTML documents, but also extends to different document types like PDFs, YouTube captions, input elements, and textareas.
By: wtetsu
Rating: 4.58 (59)
Version: 1.5.13 (Last updated: 2022-05-02)
Creation date: 2018-09-09
Weekly download count: 38
Firefox on Android: No
Risk impact: Very low risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • storage
  • unlimitedStorage
  • activeTab
Size: 3.68M
URLs: Website
Stats date:

Other platforms

Mouse Dictionary
Mouse Dictionary (v1.6.7)
4.75 (102) 100,000
Not available on Edge
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Mouse Dictionary is a super fast dictionary for Google Chrome.

Designed to use mainly for English-Japanese, Japanese-English, and English-English, but it's available for other languages too.


  • Super fast!!!
  • Awesome phrases detection
  • Capable of importing your own text data
  • Customizable view

Available not only normal HTML document:

  • PDF documents
  • YouTube captions
  • input elements
  • textarea
User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Quick and efficient translation
  • Near-instantaneous dictionary response time
  • Ability to read entire English websites with one-hand using a scroll mouse or touchpad
  • Lack of updates for the Firefox version
  • Some users unable to understand or change the language of definitions
  • Dicussed features/settings are missing or difficult to find
Most mentioned
  • Rapid translation when hovering the cursor over English words
  • Desire for update parity with the Chrome version
  • Requests for additional options such as initial pop-up position customization and saving pop-up position and size
Recent reviews
カーソルを英単語に合わせるとすごくスムーズに辞書のしっかりとした文章が出てくる 翻訳機能と比べると使う場面は少ないが、性能の高さに驚く一品

View all user reviews
Risk impact

Mouse Dictionary is safe to use. It does not request any sensitive permissions.

Risk likelihood

Mouse Dictionary has earned a fairly good reputation and likely can be trusted.

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