The point here isn't "web browser windows in VR" btw, Quest can do that fine, but on Frame you can replace the web browser windows with any other Arm64 Linux apps you can imagine.
I'll see if I can think of a more interesting demonstration of this without pissing off Valve soon..
A lot of people forget the Steam Frame is running a proper PC OS, you can do stuff like this entirely self-contained with no PC connection at all, just some chromium windows on-device.
Doing stuff like this is some of my favorite casual VR use.
I hope it releases soon!