This explains part of the story and gives the relevant pointers: https://bugzilla.mozilla.org/show_bug.cgi?id=716361
As explained in comment #6 there, this bug was introduced as a fix to: https://bugzilla.mozilla.org/show_bug.cgi?id=650078 and broke the case where -ProfileManager was used in conjunction with -no-remote to launch a new instance. That use case was addressed in https://bugzilla.mozilla.org/show_bug.cgi?id=716110 which introduces a new flag, -new-instance, to do what -no-remote was doing before. The patch (present in 716110 linked above) is pretty simple and it should be possible to backport it to Wheezy. I am affected by it as well. Currently I have to launch Iceweasel without -no-remote for the first instance, and with it for the other instances, in order to get a similar workflow as before. Alternatively, Iceweasel can also be patched in Wheezy to undo this commit: http://hg.mozilla.org/mozilla-central/rev/ba38da32b848 in order to recover the old behaviour of -no-remote. -- Pedro Gimeno -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org