If only. Have you tried Google Earth on Firefox lately? You can't even zoom in and out any more without waiting many seconds. It's CPU bound, not I/O or graphics bound. Anyone know what went wrong in there? Is it a deliberate attempt by Google to force people to Chrome?
As for games, the browser environment is still rather limited. WebGPU is (mostly) single thread. (You can share memory between processes, which is something else.) It's a subset of Vulkan - one command queue, and no bindless mode. Google proposes to fix that around December 2026.
On the other hand, there is absolutely no reason that Uber or Waymo needs to have an "app".