The technology works by measuring the time of flight or signal strength between a user's device and multiple nearby WiFi routers

All of that can still be spoofed, and there's no guarantee any other wifi routers are within range. Some adapters won't even background scan at all while you're connected to a station already. Not to mention information like that is not accessible in the first place unless you're running a real app outside the browser.

On Android and iOS, apps can get a list of visible BSSIDs without special permissions (on Android 10 and later, ACCESS_FINE_LOCATION is required).

The tech is thwarted without this permission. Unless browsers also share BSSIDs on laptops. Probably chromium does and Firefox followed suit because of Google money