New WebGL warning in recent Firefox versions

[thw0rted]

Sandcastle example: any Sandcastle

Browser: Firefox 70+

Operating System: Windows

The latest Firefox has started spewing multiple copies of the following into the console:

Error: WebGL warning: generateMipmap: Tex image TEXTURE_2D level 0 is incurring lazy initialization.

It points to this line in Texture#generateMipmap.

[mramato]

Was curious about this and found this: https://stackoverflow.com/questions/57734645/error-tex-image-texture-2d-level-0-is-incurring-lazy-initialization-on-webgl

I suspect our usage falls into a "ignore this warning, Firefox is being too chirpy" category, but @lilleyse or someone that knows more about the renderer should confirm.