Arrow Keys and Close button

Hi,

This plugin is pretty cool.
I’ve got a glitch and was wondering if you could help me with this issue.
The left and right arrow keys seems to function improperly. Currently the buttons when clicked behave irrationally, they come down every time you click them.
When I try to close the window, the x button does not function as intended.
Also when viewed with Firefox, the thumbnails are way off.

Recap:
1. Right and left arrow
2. Close, X button
3. Firefox thumbnails

Please take a look:
http://starlafortunatowordpress.iamforhumanity.com/proof_gallery/client-proof-sheet/

Thank you.

https://ww.wp.xz.cn/plugins/pixproof/