Want to let my nephew use my PC for gaming (including multiplayer), but don't want them using the web browsers (chrome, edge, brave) for anything (browsing, downloading, uploading anything).

Separate windows account already setup (non-admin), so all installation and admin settings require an admin password, which is great.

I want to still use web browsers sometimes on that account. Ideally I want to make it so that opening a browser requires an admin password to open, similar to how opening windows firewall settings require an admin password and it 'boops' the PC.