dcarrera@ - Thanks for filing the issue.

In Chrome 57 or above, WebGL can be disabled by following below steps:

1. Please navigate to chrome://flags and search for webgl and choose disabled option from drop down to disable it. 
(or) 
2. Navigate to chrome://flags/#enable-es3-apis and set it to Disabled.

Screenshot attached for the same.

Please follow the above steps to disable WebGl and please let us know if the issue resolves or not.

Thanks...!!

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	webgl.JPG 19.2 KB View Download

Not really.  That's WebGL2.

For WebGL1, you can pass in commandline switch --disable-webgl

Also, if you want to disable all GPU usage along with WebGL, you can uncheck "Use hardware acceleration" in the regular Chrome settings (chrome://settings).

However, just on the fingerprinting side, I'll point out that _disabling_ WebGL actually makes your browser more unique. It's estimated that 95% of desktop users have WebGL support, so having WebGL provides 0.074 bits of fingerprint, while not having WebGL provides 4.32 bits.

(Although there are more queries available via WebGL that could be used for further fingerprinting by a very dedicated fingerprinter. This is unusual to the best of my knowledge.)

Thanks for looking into this.

I added "--disable-webgl" to /etc/chromium-browser/default, and now it's disabled. 

Testing on panopticlick.eff.org my fingerprint seems to be less unique now (by about 1 bit). I understand that disabling WebGL makes me stand out too, but as kainino said, having it enabled allows more queries that make me stand out even more. I'm not sure that you need to be a very dedicated fingerprinter. There's probably a library somewhere that people can just download.

https://browserleaks.com/webgl

#4: FYI, starting with M59 when unchecking "Use hardware acceleration" it won't disable WebGL usage because SwiftShader will kick in to perform 3D rendering on the CPU.