All browsers on iOS are basically reskinned versions of Safari since they all have to use WebKit

Looks like the back (and side) cover clips on. IFixit has repair guides available already. Inside, it looks like basically any regular phone. No Fairphone-esque modules. The inside seems to be well-designed for repairability though – separate bottom board and battery pull tabs. All of the side buttons are attached to the back cover and a thin cable connects to the main board under some plastic. That’s going to be easy to break while repairing…

I looked at all 3 phones, they are all similarly built to the Pro model I linked.