What is the most modern mobile browser possible to install into an old Android 1.5, 1.6?

I got in my hand an old Sony Ericsson Xperia X10 mini pro from 12 years ago and this is a quite nice, beautiful, and outdated Android. I do have however interest in seeing how modern mobile apps behave on this device. The default Android browser simply doesn't open any page anymore, but I got it rooted and installed the first Opera version (6.x) I found on APK Mirror. Does anyone know which exact version is the most modern browser that this Android 1.6 device can run?