diff --git a/netwerk/protocol/http/nsCORSListenerProxy.cpp b/netwerk/protocol/http/nsCORSListenerProxy.cpp
index 3cd81931603a..e8fd724aa5c2 100644
--- a/netwerk/protocol/http/nsCORSListenerProxy.cpp
+++ b/netwerk/protocol/http/nsCORSListenerProxy.cpp
@@ -210,25 +210,26 @@ nsPreflightCache::CacheEntry::CheckRequest(const nsCString& aMethod,
   PurgeExpired(TimeStamp::NowLoRes());
 
   if (!aMethod.EqualsLiteral("GET") && !aMethod.EqualsLiteral("POST")) {
-    uint32_t i;
-    for (i = 0; i < mMethods.Length(); ++i) {
-      if (aMethod.Equals(mMethods[i].token))
-        break;
-    }
-    if (i == mMethods.Length()) {
+    struct CheckToken {
+      bool Equals(const TokenTime& e, const nsCString& method) const {
+        return e.token.Equals(method);
+      }
+    };
+
+    if (!mMethods.Contains(aMethod, CheckToken())) {
       return false;
     }
   }
 
-  for (uint32_t i = 0; i < aHeaders.Length(); ++i) {
-    uint32_t j;
-    const auto& comparator = nsCaseInsensitiveCStringComparator();
-    for (j = 0; j < mHeaders.Length(); ++j) {
-      if (aHeaders[i].Equals(mHeaders[j].token, comparator)) {
-        break;
-      }
+  const struct CheckHeaderToken {
+    bool Equals(const TokenTime& e, const nsCString& header) const {
+      return e.token.Equals(header, comparator);
     }
-    if (j == mHeaders.Length()) {
+
+    const nsCaseInsensitiveCStringComparator comparator;
+  } checker;
+  for (uint32_t i = 0; i < aHeaders.Length(); ++i) {
+    if (!mHeaders.Contains(aHeaders[i], checker)) {
       return false;
     }
   }