Eevee, did you do anything outside the base WebGL APIs? My Firefox is throwing a fit about WebGL even after some about:config fiddling. Still probably on me, but I figured I'd ask before really diving into this.
Viewing post in Rogue Ike jam comments
Thanks for the insanely quick reply. I did some console debugging and figured out that I needed webgl.force-enabled on in about:config before I could get to the point where I'd see your indirect call to null. Will restart FF now and try one more time, if I hit a third error I'll have to wait until I have a block of serious debugging time.