It uses your default browser engine to create an light-weight instance for that browser, so you will have access to all your accounts. 
You can also click the three dots in the top right corner to open the link in your browser. This just to keep things bit more contained and enables multitasking features.
https://video.nostr.build/188998285049a18fc23eec45fb6fd6e83e1623be46c8910f355ba3bf68599569.mp4