Issue with Firefox 64 and WebGL

Using the latest Firefox 64(or Firefox Developer edition) you get this warning all the time:
Error: WebGL warning: clear: This operation requires zeroing texture data. This is slow.
You can reproduce this in a lot of the three.js official examples like:
https://threejs.org/examples/#webgl_animation_cloth for example.

There is a reference in the Gecko code about this here:
https://github.com/mozilla/gecko-dev/blob/1cdb198bd9e1d2605ac48d2588e29475fb01a74e/dom/canvas/WebGLTexture.cpp#L636-L647

Author: Fantashit

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