wtetsu/mouse-dictionary

Health v2 · maintenance only

Adoption not part of the score

1096 stars · 71 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Mouse Dictionary is a super fast browser extension that shows dictionary definitions instantly when you select or hover over words on web pages, PDFs, and YouTube captions. It supports English-Japanese and Japanese-English lookups, custom dictionaries, and a customizable view.

Use cases

• look up English words while reading web pages
• translate selected text instantly in the browser
• read English PDFs with a built-in dictionary
• study English vocabulary while browsing
• look up words in YouTube captions
• use a Japanese-English dictionary while reading
• add custom dictionary data for specialized terms

When to choose

• you read English or Japanese web content and want instant word lookups without leaving the page
• you need dictionary support across HTML, PDF, and video captions
• you want a fast, customizable, extensible browser dictionary

When to avoid

• you need a full-featured translation service for whole sentences or documents
• you need offline dictionary software outside the browser
• you need language pairs other than English/Japanese without importing custom dictionaries

Facets

plugin · maturity active

browser-extension nlp internationalization browser-extensions education browser browser-extension dictionary english-japanese reading-assistant popup-dictionary language-learning localization natural-language-processing

Member repositories

For agents

markdown · JSON · MCP: product_card(name="wtetsu/mouse-dictionary")