diff --git a/dom/bindings/test/test_sequence_wrapping.html b/dom/bindings/test/test_sequence_wrapping.html
index c868471238a..e4f18f9986c 100644
--- a/dom/bindings/test/test_sequence_wrapping.html
+++ b/dom/bindings/test/test_sequence_wrapping.html
@@ -19,32 +19,41 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=775852
 <script type="application/javascript">
 
 /** Test for Bug 775852 **/
-var gl = $("c").getContext("experimental-webgl");
-var setterCalled = false;
+function doTest() {
+  try {
+    var gl = $("c").getContext("experimental-webgl");
+  } catch (e) {
+    // No WebGL support on MacOS 10.5.  Just skip this test
+    todo(false, "WebGL not supported");
+    return;
+  }
+  var setterCalled = false;
 
-extLength = gl.getSupportedExtensions().length;
-ok(extLength > 0,
-   "This test won't work right if we have no supported extensions");
+  extLength = gl.getSupportedExtensions().length;
+  ok(extLength > 0,
+     "This test won't work right if we have no supported extensions");
 
-Object.defineProperty(Array.prototype, "0",
-  {
-    set: function(val) {
-           setterCalled = true;
-         }
-  });
+  Object.defineProperty(Array.prototype, "0",
+    {
+      set: function(val) {
+             setterCalled = true;
+           }
+    });
 
-// Test that our property got defined correctly
-var arr = []
-arr[0] = 5;
-is(setterCalled, true, "Setter should be called when setting prop on array");
+  // Test that our property got defined correctly
+  var arr = []
+  arr[0] = 5;
+  is(setterCalled, true, "Setter should be called when setting prop on array");
 
-setterCalled = false;
+  setterCalled = false;
 
-is(gl.getSupportedExtensions().length, extLength,
-   "We should still have the same number of extensions");
+  is(gl.getSupportedExtensions().length, extLength,
+     "We should still have the same number of extensions");
 
-is(setterCalled, false,
-   "Setter should not be called when getting supported extensions");
+  is(setterCalled, false,
+     "Setter should not be called when getting supported extensions");
+}
+doTest();
 </script>
 </pre>
 </body>