Suggestion Rated 4 out of 5 stars

Just like there is a "Favorite" star next to the address line in Firefox (pressing it calls up a box to add the address as a favorite), there could be an option to display presence of several microformats as such small small icons.

Otherwise, perhaps something like a bar of microformats presentce indicator lights between the address bar and the google searchbox could also allow to avoide intrusive second toolbar line.

This review is for a previous version of the add-on (0.9.3).