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diff --git a/dom/plugins/test/testplugin/nptest_utils.cpp b/dom/plugins/test/testplugin/nptest_utils.cpp
new file mode 100644
index 0000000000..39a3f4b7b7
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+++ b/dom/plugins/test/testplugin/nptest_utils.cpp
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+/* ***** BEGIN LICENSE BLOCK *****
+ *
+ * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Contributor(s):
+ *   Josh Aas <josh@mozilla.com>
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nptest_utils.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+NPUTF8* createCStringFromNPVariant(const NPVariant* variant) {
+  size_t length = NPVARIANT_TO_STRING(*variant).UTF8Length;
+  NPUTF8* result = (NPUTF8*)malloc(length + 1);
+  memcpy(result, NPVARIANT_TO_STRING(*variant).UTF8Characters, length);
+  result[length] = '\0';
+  return result;
+}
+
+NPIdentifier variantToIdentifier(NPVariant variant) {
+  if (NPVARIANT_IS_STRING(variant))
+    return stringVariantToIdentifier(variant);
+  else if (NPVARIANT_IS_INT32(variant))
+    return int32VariantToIdentifier(variant);
+  else if (NPVARIANT_IS_DOUBLE(variant))
+    return doubleVariantToIdentifier(variant);
+  return 0;
+}
+
+NPIdentifier stringVariantToIdentifier(NPVariant variant) {
+  assert(NPVARIANT_IS_STRING(variant));
+  NPUTF8* utf8String = createCStringFromNPVariant(&variant);
+  NPIdentifier identifier = NPN_GetStringIdentifier(utf8String);
+  free(utf8String);
+  return identifier;
+}
+
+NPIdentifier int32VariantToIdentifier(NPVariant variant) {
+  assert(NPVARIANT_IS_INT32(variant));
+  int32_t integer = NPVARIANT_TO_INT32(variant);
+  return NPN_GetIntIdentifier(integer);
+}
+
+NPIdentifier doubleVariantToIdentifier(NPVariant variant) {
+  assert(NPVARIANT_IS_DOUBLE(variant));
+  double value = NPVARIANT_TO_DOUBLE(variant);
+  // sadly there is no "getdoubleidentifier"
+  int32_t integer = static_cast<int32_t>(value);
+  return NPN_GetIntIdentifier(integer);
+}
+
+/*
+ * Parse a color in hex format, #AARRGGBB or AARRGGBB.
+ */
+uint32_t parseHexColor(const char* color, int len) {
+  uint8_t bgra[4] = {0, 0, 0, 0xFF};
+  int i = 0;
+
+  // Ignore unsupported formats.
+  if (len != 9 && len != 8) return 0;
+
+  // start from the right and work to the left
+  while (len >= 2) {  // we have at least #AA or AA left.
+    char byte[3];
+    // parse two hex digits
+    byte[0] = color[len - 2];
+    byte[1] = color[len - 1];
+    byte[2] = '\0';
+
+    bgra[i] = (uint8_t)(strtoul(byte, nullptr, 16) & 0xFF);
+    i++;
+    len -= 2;
+  }
+  return (bgra[3] << 24) | (bgra[2] << 16) | (bgra[1] << 8) | bgra[0];
+}