Changes

===Pro having a pref===

* It would allow the user to select the best trade-off of the pros and cons above, at their discretion.

* There may be an element of the religious emacs-vs-vi / pro-life-versus-pro-choice debate to this: People who care tend to have a strong preference one way or the other, depending on their personal browsing style and which UI they think works best, and it may be that no amount of discussion will change that viewpoint. In particular, do you mostly browse with tabless single windows, or mostly with a multi-tabbed single window? Perhaps whichever mode you are closest to will drive your assumptions the most about expected behaviour.