Half of what I am seeking ... Rated 4 out of 5 stars
Works. Would be nice if it could include the settings AND the add-ons in one package.This review is for a previous version of the add-on (22.214.171.124-signed).
There's an add-on for that
OPIE (https://addons.mozilla.org/en-US/firefox/addon/opie/) is a companion to FEBE and CLEO that does just that. It will export any extension preferences and imported into another profile or Fx installation.
While it won't put the add-on and the preferences into a single package, it will allow importing of one or several preference files at one time from a single package.