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.

10ten Japanese Reader aims to be simple, reliable, fast, and always up-to-date. Twitter: @10tenstudy