After wordpress update website main slider and Gmedia gallery does not work

Hello,
my name is Justin. I’m American rock band Who Painted Stars (www.whopaintedstars.com) website admin.

After updating wordpress version main musicspace theme slider and Gmedia gallery is not working anymore. Slider goes still and Gmedia gallery after clicking on pictures not getting full-size. This problem is only with Firefox. When I open website with Internet Explorer everything works fine, but with Firefox are problems. I’m not very good in front end part, so could you help me at this point ??

Here are links:
main website https://www.whopaintedstars.com/
part to gmedia library https://www.whopaintedstars.com/gallery/
Lot of thanx for everyone ??

Justin