Just to be sure I reinstalled flashplugin-nonfree and restarted iceweasel. The browser had been up since the upgrade of libnss3-1d. The odd thing is, although I didn't notice any message saying I needed to restarted iceweasel in the logged in user (gnome) session. But in the VNC session of a _different_ user, a popup message said an iceweasel restart was needed.
The objdump output contains references to NSS_3.12.6 in both libraries. Thanks for that diagnostic tool tip, filed for future reference/use. While these are iceweasel quirks and it would make sense that one would have to restart the browser if a plugin was reinstalled/upgraded, there was no way to know at the time of the libnss3-1d upgrade that one of the reverse depends of libnss3-1d (flashplugin-nonfree) would get trashed. OK to close. -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org