Firefox resist fingerprinting uses white noise to spoof canvas images, see #25.

Both htmlcanvaselement and webgl are needed to spoof canvas image. webgl also spoofs information about the graphic card. It is not clear how to configure the extension if I want canvas image spoofing by resist fingerprinting but I also want other protections from webgl.

I propose moving "WebGLRenderingContext.prototype.readPixels" and "WebGL2RenderingContext.prototype.readPixels" to htmlcanvaselement wrapping group, checking all other wrappers and changing the description accordingly.