Reviews of Mouse Dictionary

By: wtetsu Add-on

List of user reviews and ratings for Mouse Dictionary

Total ratings

4.54 (Rating count: 67)

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Review summary

Users praise Mouse Dictionary for Firefox as a convenient, fast tool that shows hover definitions with minimal delay and improves reading on web pages and PDFs. However, there are recurring concerns about usability—the interface and settings are not intuitive, and guidance on accessing preferences is lacking. Maintenance is another worry, with multiple reviews noting that the Firefox version is not updated recently. Overall, the add-on is highly useful and performant, but onboarding and ongoing maintenance could be significantly improved.

Pros

Very convenient and useful for everyday dictionary lookups.
Fast and responsive hover-based dictionary with near-zero latency.
Improves reading experience on websites and local PDFs, enabling easy, one-handed reading.
Works across PC and mobile contexts, broadening where you can look up words.
Provides solid dictionary entries and examples, aiding comprehension.

Cons

UI/UX is not intuitive and the setup can be confusing.
Guidance for accessing and using Firefox preferences/settings is lacking.
Firefox version updates are infrequent; the add-on feels out of date.

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User Reviews

Recent rating average: 4.40

All time rating average: 4.54

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6% (4)

Date	Author	Comment
2026-03-20	ta*****	pcとスマホ両方に入れています。 Android端末にはiceravenブラウザを使用。（前はkiwiを使っていました）辞書データは英辞郎の購入がおすすめです。486円で一度買えば何度でも再ダウンロードが可能。（私は2019年に買いましたが、先日2024年修正版をDLしました）ただし辞書データを入れるときはテキストを分割して複数に分けて入れないと途中でタイムアウトしちゃってうまくいきません。（私が安価で非力なエントリーモデルを使ってるせいかも）
pcとスマホ両方に入れています。 Android端末にはiceravenブラウザを使用。（前はkiwiを使っていました）辞書データは英辞郎の購入がおすすめです。486円で一度買えば何度でも再ダウンロードが可能。（私は2019年に買いましたが、先日2024年修正版をDLしました）ただし辞書データを入れるときはテキストを分割して複数に分けて入れないと途中でタイムアウトしちゃってうまくいきません。（私が安価で非力なエントリーモデルを使ってるせいかも）
2025-12-13	so*****	Please, include a guide of how to get to the preferences site on Firefox. It is not the same as the Github guide, and I had no idea where to go
Please, include a guide of how to get to the preferences site on Firefox. It is not the same as the Github guide, and I had no idea where to go
2025-06-05	Yo*****

2025-04-07	远离*****

2025-03-05	yo*****	テクノロジーブログをよく読みます。単語がすぐ判ります。localのPDFの単語も判ります。マニュアルを読むときに便利です。
テクノロジーブログをよく読みます。単語がすぐ判ります。localのPDFの単語も判ります。マニュアルを読むときに便利です。
2025-02-13	全民*****

2025-02-03	Pe*****	Super excellent dictionary, thank you. For those having some trouble getting the english-english dictionary to work: here's some more info for mouse dictionary for firefox: follow all the links, all the information is there. info for the english-english dictionary is at the bottom of the page. Download the whole lot, i.e. the zip file Unzip on your hard drive. To import the dictionary data, choose the following options: Character set of dictionary data: UTF-8 Format of dictionary data: JSON Choose file: dictionary.json Plus, in the browser extensions navigate to: Manage Extension Shortcuts to select what keys to activte the plugin, (ALT+Z is suggested) the shortcut activates it and de-activates it too. Good luck, it's worth the work :)
Super excellent dictionary, thank you. For those having some trouble getting the english-english dictionary to work: here's some more info for mouse dictionary for firefox: follow all the links, all the information is there. info for the english-english dictionary is at the bottom of the page. Download the whole lot, i.e. the zip file Unzip on your hard drive. To import the dictionary data, choose the following options: Character set of dictionary data: UTF-8 Format of dictionary data: JSON Choose file: dictionary.json Plus, in the browser extensions navigate to: Manage Extension Shortcuts to select what keys to activte the plugin, (ALT+Z is suggested) the shortcut activates it and de-activates it too. Good luck, it's worth the work :)
2025-01-24	Ti*****	if this add on is useful... its not very intuitive. spent about 10 mins trying to figure out how it works... to no avail.
if this add on is useful... its not very intuitive. spent about 10 mins trying to figure out how it works... to no avail.
2024-10-04	Fi*****	非常に便利で毎日のように使っています Firefox版の更新もよろしくお願いします
非常に便利で毎日のように使っています Firefox版の更新もよろしくお願いします
2024-09-05	Ed*****	sooo cool
sooo cool