Rated 5 out of 5 stars

Good one, i get almost everything i need.
What could be improved:
1) it could be good if user could choose in some settings what EXIF data could be shown.
2) I'd like to have additional "Close" button at the image info window, it should be simplier that click small cross button at the corner.
Anyway it is 5 of 5 stars.
Very easy to use.

This review is for a previous version of the add-on (0.3.2). 

Addressing your comments

Thanks for your comment.

Point 1 I plan to address when adding a few more data to be used.

Regarding point 2 it might help you to know that hitting Escape closes the properties window in SM 2 and FF 3.5. It doesn't close the new Exif window in FF 3.6 right now but this I already added in the current draft for the next version.