Currently, "send to device" feature on Android follows the "<account name>'s Firefox on <device name>" scheme.
However, as you can see, it makes it nearly impossible to distinguish between different devices.
I suggest it should follow "<device name>, <account name>'s Firefox" scheme. For example:
HomePC, Bob's Firefox
In any case, "Firefox" should be either moved to the end or removed entirely*, since it doesn't seem to convey any significant information as it stands.
*Probably not, I suspect that a beta version would have a different name