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diff --git a/toolkit/components/places/Helpers.h b/toolkit/components/places/Helpers.h
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+/* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_places_Helpers_h_
+#define mozilla_places_Helpers_h_
+
+/**
+ * This file contains helper classes used by various bits of Places code.
+ */
+
+#include "mozilla/storage.h"
+#include "nsIURI.h"
+#include "nsThreadUtils.h"
+#include "nsProxyRelease.h"
+#include "prtime.h"
+#include "mozilla/Telemetry.h"
+#include "mozIStorageStatementCallback.h"
+
+namespace mozilla {
+namespace places {
+
+////////////////////////////////////////////////////////////////////////////////
+//// Asynchronous Statement Callback Helper
+
+class WeakAsyncStatementCallback : public mozIStorageStatementCallback {
+ public:
+  NS_DECL_MOZISTORAGESTATEMENTCALLBACK
+  WeakAsyncStatementCallback() = default;
+
+ protected:
+  virtual ~WeakAsyncStatementCallback() = default;
+};
+
+class AsyncStatementCallback : public WeakAsyncStatementCallback {
+ public:
+  NS_DECL_ISUPPORTS
+  AsyncStatementCallback() = default;
+
+ protected:
+  virtual ~AsyncStatementCallback() = default;
+};
+
+/**
+ * Macros to use in place of NS_DECL_MOZISTORAGESTATEMENTCALLBACK to declare the
+ * methods this class assumes silent or notreached.
+ */
+#define NS_DECL_ASYNCSTATEMENTCALLBACK                     \
+  NS_IMETHOD HandleResult(mozIStorageResultSet*) override; \
+  NS_IMETHOD HandleCompletion(uint16_t) override;
+
+/**
+ * Utils to bind a specified URI (or URL) to a statement or binding params, at
+ * the specified index or name.
+ * @note URIs are always bound as UTF8.
+ */
+class URIBinder  // static
+{
+ public:
+  // Bind URI to statement by index.
+  static nsresult Bind(mozIStorageStatement* statement, int32_t index,
+                       nsIURI* aURI);
+  // Statement URLCString to statement by index.
+  static nsresult Bind(mozIStorageStatement* statement, int32_t index,
+                       const nsACString& aURLString);
+  // Bind URI to statement by name.
+  static nsresult Bind(mozIStorageStatement* statement, const nsACString& aName,
+                       nsIURI* aURI);
+  // Bind URLCString to statement by name.
+  static nsresult Bind(mozIStorageStatement* statement, const nsACString& aName,
+                       const nsACString& aURLString);
+  // Bind URI to params by index.
+  static nsresult Bind(mozIStorageBindingParams* aParams, int32_t index,
+                       nsIURI* aURI);
+  // Bind URLCString to params by index.
+  static nsresult Bind(mozIStorageBindingParams* aParams, int32_t index,
+                       const nsACString& aURLString);
+  // Bind URI to params by name.
+  static nsresult Bind(mozIStorageBindingParams* aParams,
+                       const nsACString& aName, nsIURI* aURI);
+  // Bind URLCString to params by name.
+  static nsresult Bind(mozIStorageBindingParams* aParams,
+                       const nsACString& aName, const nsACString& aURLString);
+};
+
+/**
+ * This extracts the hostname from the URI and reverses it in the
+ * form that we use (always ending with a "."). So
+ * "http://microsoft.com/" becomes "moc.tfosorcim."
+ *
+ * The idea behind this is that we can create an index over the items in
+ * the reversed host name column, and then query for as much or as little
+ * of the host name as we feel like.
+ *
+ * For example, the query "host >= 'gro.allizom.' AND host < 'gro.allizom/'
+ * Matches all host names ending in '.mozilla.org', including
+ * 'developer.mozilla.org' and just 'mozilla.org' (since we define all
+ * reversed host names to end in a period, even 'mozilla.org' matches).
+ * The important thing is that this operation uses the index. Any substring
+ * calls in a select statement (even if it's for the beginning of a string)
+ * will bypass any indices and will be slow).
+ *
+ * @param aURI
+ *        URI that contains spec to reverse
+ * @param aRevHost
+ *        Out parameter
+ */
+nsresult GetReversedHostname(nsIURI* aURI, nsString& aRevHost);
+
+/**
+ * Similar method to GetReversedHostName but for strings
+ */
+void GetReversedHostname(const nsString& aForward, nsString& aRevHost);
+
+/**
+ * Reverses a string.
+ *
+ * @param aInput
+ *        The string to be reversed
+ * @param aReversed
+ *        Output parameter will contain the reversed string
+ */
+void ReverseString(const nsString& aInput, nsString& aReversed);
+
+/**
+ * Generates an 12 character guid to be used by bookmark and history entries.
+ *
+ * @note This guid uses the characters a-z, A-Z, 0-9, '-', and '_'.
+ */
+nsresult GenerateGUID(nsACString& _guid);
+
+/**
+ * Determines if the string is a valid guid or not.
+ *
+ * @param aGUID
+ *        The guid to test.
+ * @return true if it is a valid guid, false otherwise.
+ */
+bool IsValidGUID(const nsACString& aGUID);
+
+/**
+ * Truncates the title if it's longer than TITLE_LENGTH_MAX.
+ *
+ * @param aTitle
+ *        The title to truncate (if necessary)
+ * @param aTrimmed
+ *        Output parameter to return the trimmed string
+ */
+void TruncateTitle(const nsACString& aTitle, nsACString& aTrimmed);
+
+/**
+ * Round down a PRTime value to milliseconds precision (...000).
+ *
+ * @param aTime
+ *        a PRTime value.
+ * @return aTime rounded down to milliseconds precision.
+ */
+PRTime RoundToMilliseconds(PRTime aTime);
+
+/**
+ * Round down PR_Now() to milliseconds precision.
+ *
+ * @return @see PR_Now, RoundToMilliseconds.
+ */
+PRTime RoundedPRNow();
+
+nsresult HashURL(const nsACString& aSpec, const nsACString& aMode,
+                 uint64_t* _hash);
+
+class QueryKeyValuePair final {
+ public:
+  QueryKeyValuePair(const nsACString& aKey, const nsACString& aValue) {
+    key = aKey;
+    value = aValue;
+  };
+
+  // QueryKeyValuePair
+  //
+  //                  01234567890
+  //    input : qwerty&key=value&qwerty
+  //                  ^   ^     ^
+  //          aKeyBegin   |     aPastEnd (may point to null terminator)
+  //                      aEquals
+  //
+  //    Special case: if aKeyBegin == aEquals, then there is only one string
+  //    and no equal sign, so we treat the entire thing as a key with no value
+
+  QueryKeyValuePair(const nsACString& aSource, int32_t aKeyBegin,
+                    int32_t aEquals, int32_t aPastEnd) {
+    if (aEquals == aKeyBegin) aEquals = aPastEnd;
+    key = Substring(aSource, aKeyBegin, aEquals - aKeyBegin);
+    if (aPastEnd - aEquals > 0)
+      value = Substring(aSource, aEquals + 1, aPastEnd - aEquals - 1);
+  }
+  nsCString key;
+  nsCString value;
+};
+
+/**
+ * Tokenizes a QueryString.
+ *
+ * @param aQuery The string to tokenize.
+ * @param aTokens The tokenized result.
+ */
+nsresult TokenizeQueryString(const nsACString& aQuery,
+                             nsTArray<QueryKeyValuePair>* aTokens);
+
+void TokensToQueryString(const nsTArray<QueryKeyValuePair>& aTokens,
+                         nsACString& aQuery);
+
+/**
+ * Used to finalize a statementCache on a specified thread.
+ */
+template <typename StatementType>
+class FinalizeStatementCacheProxy : public Runnable {
+ public:
+  /**
+   * Constructor.
+   *
+   * @param aStatementCache
+   *        The statementCache that should be finalized.
+   * @param aOwner
+   *        The object that owns the statement cache.  This runnable will hold
+   *        a strong reference to it so aStatementCache will not disappear from
+   *        under us.
+   */
+  FinalizeStatementCacheProxy(
+      mozilla::storage::StatementCache<StatementType>& aStatementCache,
+      nsISupports* aOwner)
+      : Runnable("places::FinalizeStatementCacheProxy"),
+        mStatementCache(aStatementCache),
+        mOwner(aOwner),
+        mCallingThread(do_GetCurrentThread()) {}
+
+  NS_IMETHOD Run() override {
+    mStatementCache.FinalizeStatements();
+    // Release the owner back on the calling thread.
+    NS_ProxyRelease("FinalizeStatementCacheProxy::mOwner", mCallingThread,
+                    mOwner.forget());
+    return NS_OK;
+  }
+
+ protected:
+  mozilla::storage::StatementCache<StatementType>& mStatementCache;
+  nsCOMPtr<nsISupports> mOwner;
+  nsCOMPtr<nsIThread> mCallingThread;
+};
+
+/**
+ * Determines if a visit should be marked as hidden given its transition type
+ * and whether or not it was a redirect.
+ *
+ * @param aIsRedirect
+ *        True if this visit was a redirect, false otherwise.
+ * @param aTransitionType
+ *        The transition type of the visit.
+ * @return true if this visit should be hidden.
+ */
+bool GetHiddenState(bool aIsRedirect, uint32_t aTransitionType);
+
+/**
+ * Used to notify a topic to system observers on async execute completion.
+ */
+class AsyncStatementTelemetryTimer : public AsyncStatementCallback {
+ public:
+  explicit AsyncStatementTelemetryTimer(Telemetry::HistogramID aHistogramId,
+                                        TimeStamp aStart = TimeStamp::Now())
+      : mHistogramId(aHistogramId), mStart(aStart) {}
+
+  NS_IMETHOD HandleCompletion(uint16_t aReason) override;
+
+ private:
+  const Telemetry::HistogramID mHistogramId;
+  const TimeStamp mStart;
+};
+
+}  // namespace places
+}  // namespace mozilla
+
+#endif  // mozilla_places_Helpers_h_