https://chromewebstore.google.com/detail/select-to-explain/ogmomfahnieibicamphdenkjicmlpfoj?hl=en

Select sentence(s) on a page to get explanations tailored to your knowledge background. Designed for understanding.

Select sentences on a page to get explanations tailored to your knowledge background. Designed for understanding.

Great for learning from online research papers.

Feature: - select to see explanations - customized to your knowledge level - manual triggering / auto triggering - can be deactivated on certain websites