There’s a box in setting called “Use Custom Tabs”, but I can’t figure out what they are.
I posted a link for this. The custom tabs documentation is at: https://developer.chrome.com/docs/android/custom-tabs/
Basically an embedded browser instead of opening in a new app window.
It’s basically the app going “Hey, default web browser, I need your help. See, this dude wants to look at a webpage but I’m too lazy to learn how to open web pages myself. Can you come over and pretend to be a part of me for a quick second?”
The difference between just embedding a WebView is that, with this approach, any modifications to the browser also apply. So, if you have, say, uBlock installed on your Android Firefox (as you should), it will work in those pages too.
Custom tabs allow Android apps to open websites in the app itself. If you disable it, when you tap on a link the page will open with your default browser instead of inside the app.