Does Negative Z-index Affect Performance Or Compatibility?

I have a web application where I need to show a 3D model using webGl in the background then showing different stuff on top of it. All is working VERY fine in firefox except in chro

Solution 1:

I've asked the question differently a second time and I got my answer, for more details check out here: https://stackoverflow.com/a/19830934/1358670