Rated 3 out of 5 stars
Nice tool. Tiff support would be nice but I have another problem.
On Mac it has conflict with system shortcut command H. It hides frontmost app. But in Thunderbird it launch Slideshow add on.
And there is little graphocal glitch in prefs. https://www.dropbox.com/s/xmvbfshhp8pktd7/Screenshot%202015-09-04%2023.20.19.png?dl=0
Hope you could do something with it.