Japanese Furigana Extension

About

Japanese Furigana Extension automatically adds phonetic readings (furigana) 
to Japanese kanji characters on any web page, making Japanese content 
accessible to learners at all levels.

✨ Key Features:
• One-click toggle from the toolbar popup
• Three furigana formats: Hiragana, Katakana, Romaji
• JLPT level filtering – skip kanji you already know (N5–N1)
• Smart hover mode – show readings only on mouse hover
• Customizable font size and color with 6 presets and live preview
• Automatic Japanese site detection (lang, domain, meta tags)
• Site whitelist for manual control
• Full English and Chinese UI

🔧 Technical:
• Powered by Kuromoji.js for accurate morphological analysis
• Uses standard <ruby> HTML tags – no page layout disruption
• Works fully offline – no external API calls
• Optimized concurrent batch processing for performance

Perfect for Japanese learners reading NHK News, Wikipedia, blogs, 
and any Japanese website.