I have written a small and simple extension to the operator extension(https://addons.mozilla.org/en-US/firefox/addon/4106) so that whenever you come across a geo encoded microformat page http://microformats.org/wiki/geo page and you want to map it using OSM then you can do so via a click of a button.
You can download the script from http://bhavesh.freeshell.org/blog/worklog/9011.html
Enjoy!!!