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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/uniforms-should-not-lose-values.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/uniforms-should-not-lose-values.html
new file mode 100644
index 0000000000..fc99f0f87f
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/uniforms-should-not-lose-values.html
@@ -0,0 +1,81 @@
+<!--
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Driver Bug - Uniforms should no lose values</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.css"/>
+<script src="../../../js/js-test-pre.js"></script>
+<script src="../../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<canvas id="canvas" width="512" height="256"> </canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshader" type="x-shader/x-vertex">
+uniform float k,u;
+uniform mat4 l;
+attribute vec3 a;
+void main(){
+  gl_Position=l*vec4(a,1.+u+k);
+}
+</script>
+<script id="fshader" type="x-shader/x-fragment">
+precision mediump float;
+uniform float w,x,y,z;
+void main() {
+ gl_FragColor=vec4(1.-y,y,w+x+z,1);
+}
+</script>
+<script>
+"use strict";
+// Certain drivers fail this test. Specifically Mac NVidia GT 330 on OSX 10.8.2
+description();
+debug("");
+var wtu = WebGLTestUtils;
+function test() {
+  var gl = wtu.create3DContext("canvas");
+  if (!gl) {
+    testFailed("context does not exist");
+    return;
+  }
+
+  wtu.setupUnitQuad(gl);
+  var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a"], undefined, true);
+
+  var setUniformf = function(name, val) {
+    var loc = gl.getUniformLocation(program, name);
+    var func = 'uniform' + val.length + 'fv';
+    gl[func](loc, val);
+  };
+
+  var setUniformMat = function(name, val) {
+    var loc = gl.getUniformLocation(program, name);
+    var func = 'uniformMatrix' + Math.sqrt(val.length) + 'fv';
+    gl[func](loc, false, val);
+  };
+
+  setUniformMat('l', [1, 0 ,0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]);
+  gl.viewport(0, 0, 256, 256);
+  setUniformf('y', [0]);
+  wtu.drawUnitQuad(gl);
+  gl.viewport(256, 0, 256, 256);
+  setUniformf('y', [1]);
+  wtu.drawUnitQuad(gl);
+  wtu.checkCanvasRect(gl, 0, 0, 256, 256, [255, 0, 0, 255]);
+  wtu.checkCanvasRect(gl, 256, 0, 256, 256, [0, 255, 0, 255]);
+
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
+}
+test();
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+</body>
+</html>
+