Rated 5 out of 5 stars

Great add-on.
I think it would be even better if you could select multiple photos and have it switch through them automatically. Like https://addons.mozilla.org/en-US/firefox/addon/browser-backgrounds/ . This is better than browser backgrounds as that just replaces the new tab page (instead of putting a photo under it).

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