9 hours of sorting Vista just about saw me off yesterday!
Still here though. Yes I did answer my own question! I did wonder though if like IE7 it was possible to do so from a single click of the bookmark itself rather than right clicking it first. In IE7 if you click a small button to the right of the favourite (bookmark) it launches a new tab as a single click rather than the left/right routine of FF.
I do now have IE7 back. One of my bundled bits of software with my Canon scanner (Omnipage 2.0) was blocking IE7, a simple uninstall did the trick. It was just luck finding the culprit amongst all the bits of software I have.