It's a good reader app. It has nice themes both light and dark. You can import your locally saved fonts into it with ease. It handles different webpages (Substack most importantly) with grace.

This reading mode extension is exceptionally effective, delivering consistently smooth performance across all devices, not only new desktop but also older laptops.

It features a diverse range of beautiful, eye-friendly, and easily switchable preset styles. Adjustments to line spacing and content area width are effortlessly managed.

The MVP feature is `font customization`, ensuring seamless viewing for languages like Japanese and Chinese—a critical advantage over similar extensions."