Voyager

Safari reader mode strips styling off webpages and displays content in a pre-defined, easy to read format. Reader mode does its best to provide a consistent layout across all sites. It’s great for accessibility but also has many more advantages:

Reader mode targets the content portions of a website and strips away the rest. In doing so it removes many common annoyances; often times paywalls are bypassed, ads are stripped away, elements like email subscribe and GDPR cookie consent popups are removed.

Normally you have to tap the “Aa” icon on the top right of the in-app Safari browser every time a new site is loaded. The new Voyager setting removes this unnecessary tap and displays reader mode automatically.

Firefox on iOS and desktop has the same functionality. I don’t know if reader mode is available on the android in-app browser as I don’t use android devices.