I am logged into my Mozilla account on four devices: Laptop Linux, Desktop Linux, Desktop Windows, Phone Android. However, when I try “Send tab to device” or list the devices in the account settings, the two Linux devices are not shown separately, so I can’t send a tab from Laptop Linux to Desktop Linux or vice versa. In fact, when I edit the Device name on either of the Linux device, that name will also be shown on the other device.

How is this possible? How can I disentangle the two devices?