verify that new WebGL extensions are disabled
Support for two new WebGL extensions was added during the ESR60 development cycle. We should verify that both are disabled via webgl.disable-extensions
= true
(which Tor Browser sets by default). See:
https://bugzilla.mozilla.org/show_bug.cgi?id=1250077 https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_compressed_texture_astc
https://bugzilla.mozilla.org/show_bug.cgi?id=1325113 https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_compressed_texture_s3tc_srgb