I posted a bug regarding the SVG icons
https://github.com/AnalyticalGraphicsInc/cesium/issues/2907
for firefox the svg needs to be adjusted, height and width need to set outside of the style, Matthew Amato, tweeked my SVG code and got it to work for firefox, IE11 also worked,
Yonatan, I think setting the size will help if your still looking at things
Also, just tried the Cesium and the SVG example with the Microsoft edge browser in Windows 10, my adjusted icons look alright there also.
The BIKS example, http://embed.plnkr.co/4QViqxaxH4SnQCK2O9xB/preview , loads up, but the icons don’t render properly, probably the size issue again