So I built WithAudio (https://with.audio). I've been working on this for the past 8 months. A one time payment desktop app that lets you listen or listen while following the text highlighting.
Soon I realised me and many users prefer to have the option to do this in their browser. So I built the browser extension. The extension is free but works only if you have the WithAudio app (which is a paid product).
Youtube demo: https://youtu.be/Vn3VwCLuPQU Chrome Extension: https://chromewebstore.google.com/detail/the-withaudio-web-c... Extension's source code: https://github.com/withaudio/withaudio-web-companion