Adding Furigana Function is a free Chrome browser extension developed by Sateraito Office. This add-on allows users to easily add Furigana characters to Kanji characters while browsing Japanese websites.

With Adding Furigana Function, a "Furigana" button is added to the browser toolbar. When viewing a Japanese website, users can simply click on the "Furigana" button to automatically add Furigana (phonetic readings) to the Kanji characters. This feature is especially useful for learners of Japanese or for those who may have difficulty reading complex Kanji characters.

Overall, Adding Furigana Function - Sateraito Office is a convenient and user-friendly tool for adding Furigana to Kanji characters while browsing Japanese websites. It is a valuable resource for anyone studying or reading Japanese online.