This is a companion plugin for the Subkit extension. DO NOT install unless Subkit is installed first. Subkit: https://chromewebstore.google.com/detail/subkit/nbfimkdbifhjfambljjggekodjlppiad You'll then need to connect Subkit to your video and enable furigana from there. See this guide for tips. https://subkit.net/docs/guides/furigana Once installed and enabled, you can see furigana added to Japanese subtitles on popular streaming platforms like Netflix, YouTube, Amazon Prime, and Disney+.