> The security risk is not caused by websites, but by the fact that the browser ...

> The security risk is not caused by websites, but by the fact that the browser can access your USB devices in the first place.

Then you'd better uninstall your browser, because this is already the case right now.

The fact that Chrome makes use of that capability and Firefox does not constitute a privilege/security boundary.

On security focused distros, it obviously works in neither browser right now, because it's a fucking stupid idea.