Flicker with Slider

I hope I'm in the right place but we use the Canvas theme in WordPress and I was hoping you might be able to help with this. We are experience an annoying flicker on our front page when people use Firefox. It doesn't happen with chrome or explorer or anything else by what I can tell.

I've Googled it and have cleaned out my cache and cookies. That's not it. Plus other people have said the same thing.

Does anyone know how to solve this?

Thanks ahead of time.

FYI, I've also tried `` and it doesn't seem to help.