Puntuado con 5 de 5 estrellas
I just wanted to say thanks for your reply ...
I'm afraid I didn't get around to finding out where I'd gone wrong, all I recall is that it began after I tried out the "Show All Toolbars" command in Options, and I only just now noticed your warning to disable other toolbars before doing so... sorry about that.
I've moved on to FF 23 Portable now and forgot to have another look before I wiped my old IceDragon directory, but it looks like a case of User Error anyway : -)
I've been using this for a few days now, and it's excellent, definitely my favourite solution of its type. The ability to include custom toolbars is extremely useful.