Working great in Firefox 16 Rated 5 out of 5 stars
NTT includes the functionality that should have been part of the new tab page, plus it adds professional-looking polish like tiles without pics being semi-transparent to show the wallpaper -- definitely a five-star addon. It really deserves some good screenshots to show off the appearance and the options.
Some requested future improvements:
1. It'd be great to have the tile name be editable along with the image in the options sidebar, instead of having to make/drag a custom bookmark onto the tile. (I think name editing was possible in an earlier version of Firefox, but not in 16.)
2. A button near the 'pin' on each tile to make Firefox refresh the thumbnail or load it for the first time.
3. Having the options sidebar shift in size or wrap words/buttons with the minimum font size, instead of having them vanish off the right side. Right now the biggest font that fits is still below what most seniors or others with moderate visual impairment can comfortably handle with glasses.