User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0 Build ID: 20150224030228 Steps to reproduce: https://www.khronos.org/registry/webgl/sdk/tests/conformance/textures/texture-upload-size.html?webglVersion=1 Actual results: conformance/textures/texture-upload-size.html (48 of 53 passed) failed: Texture was smaller than the expected size 4x4 failed: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 failed: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 failed: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 failed: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 Expected results: Chrome passes all the tests. Firefox fails with both the ANGLE and OpenGL backends.

Reproduced this to fail (seems to be hardware independent) on the following systems: - SPARK, GIADA, MACBOOK_AIR_OSX, MACBOOK_AIR_WIN, MACBOOK_PRO_OSX, MACBOOK_PRO_WIN, MACMINI, MACPRO, NEXUS-4, NEXUS-10, SURFACE, WINDBOX, HASWELL, HPOMEN See https://bugzilla.mozilla.org/show_bug.cgi?id=1178601 for hardware configuration details of these systems.

Passing on Intel HD 4000 under Ubuntu 16.04 and Windows 10. 50.0a1 (2016-06-25)