Hi @bowsertattoo,
Thanks for posting. It looks like you currently have these background images set to fixed
The fixed setting on bg images will give them the parallax effect—I was able to see the parallax scroll in all both chrome and firefox
Once removed the issue should be resolved.
Regarding the triangles it looks like you are using a trapezoid shaped icon as a bg image to create this shape. Instead, I recommend using a triangle as that will be easier to make compatible across all browsers.
A second alternative is to create these triangles with CSS: CSS Triangle inside of Webflow
I hope this helps! 