Closing one Web window closes all of them (with proprietary Nvidia drivers)

### What Happened?

This is in a Daily build of elementary OS with all updates installed:

The "X" button in the window's title bar closes all open Web windows, not just the current one.

As a workaround, one can close all tabs individually until the window automatically closes itself.

### Steps to Reproduce

1. Open multiple windows.
2. Try to close one of them.
3. All windows close at the same time.

### Expected Behavior

Only the current/clicked window should be closed.

### OS Version

7.x (Horus)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

This is on an Nvidia box, using proprietary drivers.