I noticed that Icedove has the same problem if I switch tabs using Ctrl+Page Up/Down while browsing a folder. Although Iceweasel generally doesn't have this bug (the tabs don't move on most pages), I'm under the impression that this is more of a tricky Mozilla bug.
-- Filipus Klutiero http://www.philippecloutier.com -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org