[webGL2.0] [firefox] qualification_order failed in AMD/NV graphics for OpenGL rendering

OS: w10
Graphics: AMD asic / NV asic
browser: firefox
config: enable webGL2.0, enable OpenGL rendering

steps:

1. run firefox, enable webGL2.0
2. visit "https://www.khronos.org/registry/webgl/sdk/tests/webgl-conformance-tests.html?version=2.0.0"
3. find test "all/deqp/data/gles3/Shaders/qualification_order" and run

expected: test pass
actually: failed: qualification_order.variables.valid.invariant_interp_storage_precision: expected shaders to compile and link properly, but failed to link.

Modify webGL/sdk/tests/deqp/modules/shared/glsShaderLibraryCase to run only the first test case:

glsShaderLibraryCase.runTestCases = function() {
var state = tcuTestCase.runner;
if (state.next()) {
try {
glsShaderLibraryCase.init();
glsShaderLibraryCase.execute();
} catch (err) {
bufferedLogToConsole(err);
}
// tcuTestCase.runner.runCallback(glsShaderLibraryCase.runTestCases); //comment out this line
} else
tcuTestCase.runner.terminate();

};

root cause:
app doesn't call glLinkProgram, glUseProgram in test

Start in webGL/sdk/tests/deqp/modules/shared/glsShaderLibraryCase at runTestCases, then reproduce the qualification_order failure using the linked WebGL 2.0 conformance test in Firefox with OpenGL rendering enabled. Check the reported shader-linking path and the existing test-case runner behavior; done means the qualification_order test runs with the intended cases and passes without the reported link failure.