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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/long-expressions-should-not-crash.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/long-expressions-should-not-crash.html
new file mode 100644
index 0000000000..eaf0509b23
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/long-expressions-should-not-crash.html
@@ -0,0 +1,136 @@
+<!--
+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 - long experssions should not crash</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>
+<script src="../../../js/glsl-conformance-test.js"></script>
+</head>
+<body>
+<canvas id="example" width="40" height="40"> </canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshader" type="x-shader/x-vertex">
+void main(){
+  gl_Position = vec4(0, 0, 0, 1);
+}
+</script>
+<script id="vshaderUniformTest" type="x-shader/x-vertex">
+uniform vec4 u_uniform;
+void main(){
+  gl_Position =
+      $(code)
+      vec4(0, 0, 0, 1);
+}
+</script>
+<script id="fshader" type="x-shader/x-fragment">
+precision mediump float;
+void main()
+{
+  gl_FragColor = vec4(0, 0, 0, 0);
+}
+</script>
+<script id="fshaderUniformTest" type="x-shader/x-fragment">
+precision mediump float;
+uniform vec4 u_uniform;
+void main()
+{
+  gl_FragColor =
+      $(code)
+      vec4(0, 0, 0, 0);
+}
+</script>
+<script>
+"use strict";
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext();
+
+var vUniformTestSource = wtu.getScript("vshaderUniformTest");
+var fUniformTestSource = wtu.getScript("fshaderUniformTest");
+
+var tests = [
+];
+var counts = [
+  { count:10,
+    mustPass: true,
+  },
+  { count:100,
+    mustPass: true,
+  },
+  { count: 1000,
+    mustPass: false,
+  },
+  { count: 10000,
+    mustPass: false,
+  },
+];
+var operatorSets = [
+  ["+", "-", "/", "*"],
+  ["+"],
+  ["-"],
+];
+counts.forEach(function(info) {
+  operatorSets.forEach(function(operators) {
+    var generateCode = function(numVars) {
+      var codes = [];
+      for (var uu = 0; uu < numVars; ++uu) {
+        codes.push("u_uniform " + operators[uu % operators.length]);
+      }
+      return {
+        code: codes.join("\n      "),
+      };
+    };
+
+    var subs = generateCode(info.count);
+    tests.push({
+      vShaderId: "vshader",
+      vShaderSuccess: true,
+      fShaderSource: wtu.replaceParams(fUniformTestSource, subs),
+      fShaderSuccess: true,
+      linkSuccess: true,
+      ignoreResults: !info.mustPass,
+      passMsg: "shader with " + info.count + " [" + operators + "] operators in expression in multiple lines",
+    });
+    tests.push({
+      vShaderSource: wtu.replaceParams(vUniformTestSource, subs),
+      vShaderSuccess: true,
+      fShaderId: "fshader",
+      fShaderSuccess: true,
+      linkSuccess: true,
+      ignoreResults: !info.mustPass,
+      passMsg: "shader with " + info.count + " [" + operators + "] operators in expression in multiple lines",
+    });
+    subs.code = subs.code.replace(/\n     /g, "")
+    tests.push({
+      vShaderId: "vshader",
+      vShaderSuccess: true,
+      fShaderSource: wtu.replaceParams(fUniformTestSource, subs),
+      fShaderSuccess: true,
+      linkSuccess: true,
+      ignoreResults: !info.mustPass,
+      passMsg: "shader with " + info.count + " [" + operators + "] operators in expression in one line",
+    });
+    tests.push({
+      vShaderSource: wtu.replaceParams(vUniformTestSource, subs),
+      vShaderSuccess: true,
+      fShaderId: "fshader",
+      fShaderSuccess: true,
+      linkSuccess: true,
+      ignoreResults: !info.mustPass,
+      passMsg: "shader with " + info.count + " [" + operators + "] operators in expression in one line",
+    });
+  });
+});
+GLSLConformanceTester.runTests(tests);
+</script>
+</body>
+</html>
+