Add m-esr52 at 52.6.0

1 files changed, 3783 insertions, 0 deletions

diff --git a/toolkit/components/downloads/nsDownloadManager.cpp b/toolkit/components/downloads/nsDownloadManager.cpp
new file mode 100644
index 000000000..ab984c5f2
--- /dev/null
+++ b/toolkit/components/downloads/nsDownloadManager.cpp
@@ -0,0 +1,3783 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Unused.h"
+
+#include "mozIStorageService.h"
+#include "nsIAlertsService.h"
+#include "nsIArray.h"
+#include "nsIClassInfoImpl.h"
+#include "nsIDOMWindow.h"
+#include "nsIDownloadHistory.h"
+#include "nsIDownloadManagerUI.h"
+#include "nsIFileURL.h"
+#include "nsIMIMEService.h"
+#include "nsIParentalControlsService.h"
+#include "nsIPrefService.h"
+#include "nsIPrivateBrowsingChannel.h"
+#include "nsIPromptService.h"
+#include "nsIPropertyBag2.h"
+#include "nsIResumableChannel.h"
+#include "nsIWebBrowserPersist.h"
+#include "nsIWindowMediator.h"
+#include "nsILocalFileWin.h"
+#include "nsILoadContext.h"
+#include "nsIXULAppInfo.h"
+#include "nsContentUtils.h"
+
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsArrayEnumerator.h"
+#include "nsCExternalHandlerService.h"
+#include "nsCRTGlue.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsDownloadManager.h"
+#include "nsNetUtil.h"
+#include "nsThreadUtils.h"
+#include "prtime.h"
+
+#include "mozStorageCID.h"
+#include "nsDocShellCID.h"
+#include "nsEmbedCID.h"
+#include "nsToolkitCompsCID.h"
+
+#include "mozilla/net/ReferrerPolicy.h"
+
+#include "SQLFunctions.h"
+
+#include "mozilla/Preferences.h"
+
+#ifdef XP_WIN
+#include <shlobj.h>
+#include "nsWindowsHelpers.h"
+#ifdef DOWNLOAD_SCANNER
+#include "nsDownloadScanner.h"
+#endif
+#endif
+
+#ifdef XP_MACOSX
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+
+#ifdef MOZ_WIDGET_ANDROID
+#include "FennecJNIWrappers.h"
+#endif
+
+#ifdef MOZ_WIDGET_GTK
+#include <gtk/gtk.h>
+#endif
+
+using namespace mozilla;
+using mozilla::downloads::GenerateGUID;
+
+#define DOWNLOAD_MANAGER_BUNDLE "chrome://mozapps/locale/downloads/downloads.properties"
+#define DOWNLOAD_MANAGER_ALERT_ICON "chrome://mozapps/skin/downloads/downloadIcon.png"
+#define PREF_BD_USEJSTRANSFER "browser.download.useJSTransfer"
+#define PREF_BDM_SHOWALERTONCOMPLETE "browser.download.manager.showAlertOnComplete"
+#define PREF_BDM_SHOWALERTINTERVAL "browser.download.manager.showAlertInterval"
+#define PREF_BDM_RETENTION "browser.download.manager.retention"
+#define PREF_BDM_QUITBEHAVIOR "browser.download.manager.quitBehavior"
+#define PREF_BDM_ADDTORECENTDOCS "browser.download.manager.addToRecentDocs"
+#define PREF_BDM_SCANWHENDONE "browser.download.manager.scanWhenDone"
+#define PREF_BDM_RESUMEONWAKEDELAY "browser.download.manager.resumeOnWakeDelay"
+#define PREF_BH_DELETETEMPFILEONEXIT "browser.helperApps.deleteTempFileOnExit"
+
+static const int64_t gUpdateInterval = 400 * PR_USEC_PER_MSEC;
+
+#define DM_SCHEMA_VERSION      9
+#define DM_DB_NAME             NS_LITERAL_STRING("downloads.sqlite")
+#define DM_DB_CORRUPT_FILENAME NS_LITERAL_STRING("downloads.sqlite.corrupt")
+
+#define NS_SYSTEMINFO_CONTRACTID "@mozilla.org/system-info;1"
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsDownloadManager
+
+NS_IMPL_ISUPPORTS(
+  nsDownloadManager
+, nsIDownloadManager
+, nsINavHistoryObserver
+, nsIObserver
+, nsISupportsWeakReference
+)
+
+nsDownloadManager *nsDownloadManager::gDownloadManagerService = nullptr;
+
+nsDownloadManager *
+nsDownloadManager::GetSingleton()
+{
+  if (gDownloadManagerService) {
+    NS_ADDREF(gDownloadManagerService);
+    return gDownloadManagerService;
+  }
+
+  gDownloadManagerService = new nsDownloadManager();
+  if (gDownloadManagerService) {
+#if defined(MOZ_WIDGET_GTK)
+    g_type_init();
+#endif
+    NS_ADDREF(gDownloadManagerService);
+    if (NS_FAILED(gDownloadManagerService->Init()))
+      NS_RELEASE(gDownloadManagerService);
+  }
+
+  return gDownloadManagerService;
+}
+
+nsDownloadManager::~nsDownloadManager()
+{
+#ifdef DOWNLOAD_SCANNER
+  if (mScanner) {
+    delete mScanner;
+    mScanner = nullptr;
+  }
+#endif
+  gDownloadManagerService = nullptr;
+}
+
+nsresult
+nsDownloadManager::ResumeRetry(nsDownload *aDl)
+{
+  // Keep a reference in case we need to cancel the download
+  RefPtr<nsDownload> dl = aDl;
+
+  // Try to resume the active download
+  nsresult rv = dl->Resume();
+
+  // If not, try to retry the download
+  if (NS_FAILED(rv)) {
+    // First cancel the download so it's no longer active
+    rv = dl->Cancel();
+
+    // Then retry it
+    if (NS_SUCCEEDED(rv))
+      rv = dl->Retry();
+  }
+
+  return rv;
+}
+
+nsresult
+nsDownloadManager::PauseAllDownloads(bool aSetResume)
+{
+  nsresult rv = PauseAllDownloads(mCurrentDownloads, aSetResume);
+  nsresult rv2 = PauseAllDownloads(mCurrentPrivateDownloads, aSetResume);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_SUCCESS(rv2, rv2);
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::PauseAllDownloads(nsCOMArray<nsDownload>& aDownloads, bool aSetResume)
+{
+  nsresult retVal = NS_OK;
+  for (int32_t i = aDownloads.Count() - 1; i >= 0; --i) {
+    RefPtr<nsDownload> dl = aDownloads[i];
+
+    // Only pause things that need to be paused
+    if (!dl->IsPaused()) {
+      // Set auto-resume before pausing so that it gets into the DB
+      dl->mAutoResume = aSetResume ? nsDownload::AUTO_RESUME :
+                                     nsDownload::DONT_RESUME;
+
+      // Try to pause the download but don't bail now if we fail
+      nsresult rv = dl->Pause();
+      if (NS_FAILED(rv))
+        retVal = rv;
+    }
+  }
+
+  return retVal;
+}
+
+nsresult
+nsDownloadManager::ResumeAllDownloads(bool aResumeAll)
+{
+  nsresult rv = ResumeAllDownloads(mCurrentDownloads, aResumeAll);
+  nsresult rv2 = ResumeAllDownloads(mCurrentPrivateDownloads, aResumeAll);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_SUCCESS(rv2, rv2);
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::ResumeAllDownloads(nsCOMArray<nsDownload>& aDownloads, bool aResumeAll)
+{
+  nsresult retVal = NS_OK;
+  for (int32_t i = aDownloads.Count() - 1; i >= 0; --i) {
+    RefPtr<nsDownload> dl = aDownloads[i];
+
+    // If aResumeAll is true, then resume everything; otherwise, check if the
+    // download should auto-resume
+    if (aResumeAll || dl->ShouldAutoResume()) {
+      // Reset auto-resume before retrying so that it gets into the DB through
+      // ResumeRetry's eventual call to SetState. We clear the value now so we
+      // don't accidentally query completed downloads that were previously
+      // auto-resumed (and try to resume them).
+      dl->mAutoResume = nsDownload::DONT_RESUME;
+
+      // Try to resume/retry the download but don't bail now if we fail
+      nsresult rv = ResumeRetry(dl);
+      if (NS_FAILED(rv))
+        retVal = rv;
+    }
+  }
+
+  return retVal;
+}
+
+nsresult
+nsDownloadManager::RemoveAllDownloads()
+{
+  nsresult rv = RemoveAllDownloads(mCurrentDownloads);
+  nsresult rv2 = RemoveAllDownloads(mCurrentPrivateDownloads);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_SUCCESS(rv2, rv2);
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::RemoveAllDownloads(nsCOMArray<nsDownload>& aDownloads)
+{
+  nsresult rv = NS_OK;
+  for (int32_t i = aDownloads.Count() - 1; i >= 0; --i) {
+    RefPtr<nsDownload> dl = aDownloads[0];
+
+    nsresult result = NS_OK;
+    if (!dl->mPrivate && dl->IsPaused() && GetQuitBehavior() != QUIT_AND_CANCEL)
+      aDownloads.RemoveObject(dl);
+    else
+      result = dl->Cancel();
+
+    // Track the failure, but don't miss out on other downloads
+    if (NS_FAILED(result))
+      rv = result;
+  }
+
+  return rv;
+}
+
+nsresult
+nsDownloadManager::RemoveDownloadsForURI(mozIStorageStatement* aStatement, nsIURI *aURI)
+{
+  mozStorageStatementScoper scope(aStatement);
+
+  nsAutoCString source;
+  nsresult rv = aURI->GetSpec(source);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aStatement->BindUTF8StringByName(
+    NS_LITERAL_CSTRING("source"), source);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool hasMore = false;
+  AutoTArray<nsCString, 4> downloads;
+  // Get all the downloads that match the provided URI
+  while (NS_SUCCEEDED(aStatement->ExecuteStep(&hasMore)) &&
+         hasMore) {
+    nsAutoCString downloadGuid;
+    rv = aStatement->GetUTF8String(0, downloadGuid);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    downloads.AppendElement(downloadGuid);
+  }
+
+  // Remove each download ignoring any failure so we reach other downloads
+  for (int32_t i = downloads.Length(); --i >= 0; )
+    (void)RemoveDownload(downloads[i]);
+
+  return NS_OK;
+}
+
+void // static
+nsDownloadManager::ResumeOnWakeCallback(nsITimer *aTimer, void *aClosure)
+{
+  // Resume the downloads that were set to autoResume
+  nsDownloadManager *dlMgr = static_cast<nsDownloadManager *>(aClosure);
+  (void)dlMgr->ResumeAllDownloads(false);
+}
+
+already_AddRefed<mozIStorageConnection>
+nsDownloadManager::GetFileDBConnection(nsIFile *dbFile) const
+{
+  NS_ASSERTION(dbFile, "GetFileDBConnection called with an invalid nsIFile");
+
+  nsCOMPtr<mozIStorageService> storage =
+    do_GetService(MOZ_STORAGE_SERVICE_CONTRACTID);
+  NS_ENSURE_TRUE(storage, nullptr);
+
+  nsCOMPtr<mozIStorageConnection> conn;
+  nsresult rv = storage->OpenDatabase(dbFile, getter_AddRefs(conn));
+  if (rv == NS_ERROR_FILE_CORRUPTED) {
+    // delete and try again, since we don't care so much about losing a user's
+    // download history
+    rv = dbFile->Remove(false);
+    NS_ENSURE_SUCCESS(rv, nullptr);
+    rv = storage->OpenDatabase(dbFile, getter_AddRefs(conn));
+  }
+  NS_ENSURE_SUCCESS(rv, nullptr);
+
+  return conn.forget();
+}
+
+already_AddRefed<mozIStorageConnection>
+nsDownloadManager::GetPrivateDBConnection() const
+{
+  nsCOMPtr<mozIStorageService> storage =
+    do_GetService(MOZ_STORAGE_SERVICE_CONTRACTID);
+  NS_ENSURE_TRUE(storage, nullptr);
+
+  nsCOMPtr<mozIStorageConnection> conn;
+  nsresult rv = storage->OpenSpecialDatabase("memory", getter_AddRefs(conn));
+  NS_ENSURE_SUCCESS(rv, nullptr);
+
+  return conn.forget();
+}
+
+void
+nsDownloadManager::CloseAllDBs()
+{
+  CloseDB(mDBConn, mUpdateDownloadStatement, mGetIdsForURIStatement);
+  CloseDB(mPrivateDBConn, mUpdatePrivateDownloadStatement, mGetPrivateIdsForURIStatement);
+}
+
+void
+nsDownloadManager::CloseDB(mozIStorageConnection* aDBConn,
+                           mozIStorageStatement* aUpdateStmt,
+                           mozIStorageStatement* aGetIdsStmt)
+{
+  DebugOnly<nsresult> rv = aGetIdsStmt->Finalize();
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  rv = aUpdateStmt->Finalize();
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  rv = aDBConn->AsyncClose(nullptr);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+}
+
+static nsresult
+InitSQLFunctions(mozIStorageConnection* aDBConn)
+{
+  nsresult rv = mozilla::downloads::GenerateGUIDFunction::create(aDBConn);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::InitPrivateDB()
+{
+  bool ready = false;
+  if (mPrivateDBConn && NS_SUCCEEDED(mPrivateDBConn->GetConnectionReady(&ready)) && ready)
+    CloseDB(mPrivateDBConn, mUpdatePrivateDownloadStatement, mGetPrivateIdsForURIStatement);
+  mPrivateDBConn = GetPrivateDBConnection();
+  if (!mPrivateDBConn)
+    return NS_ERROR_NOT_AVAILABLE;
+
+  nsresult rv = InitSQLFunctions(mPrivateDBConn);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = CreateTable(mPrivateDBConn);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = InitStatements(mPrivateDBConn, getter_AddRefs(mUpdatePrivateDownloadStatement),
+                      getter_AddRefs(mGetPrivateIdsForURIStatement));
+  NS_ENSURE_SUCCESS(rv, rv);
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::InitFileDB()
+{
+  nsresult rv;
+
+  nsCOMPtr<nsIFile> dbFile;
+  rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                              getter_AddRefs(dbFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = dbFile->Append(DM_DB_NAME);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool ready = false;
+  if (mDBConn && NS_SUCCEEDED(mDBConn->GetConnectionReady(&ready)) && ready)
+    CloseDB(mDBConn, mUpdateDownloadStatement, mGetIdsForURIStatement);
+  mDBConn = GetFileDBConnection(dbFile);
+  NS_ENSURE_TRUE(mDBConn, NS_ERROR_NOT_AVAILABLE);
+
+  rv = InitSQLFunctions(mDBConn);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool tableExists;
+  rv = mDBConn->TableExists(NS_LITERAL_CSTRING("moz_downloads"), &tableExists);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!tableExists) {
+    rv = CreateTable(mDBConn);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // We're done with the initialization now and can skip the remaining
+    // upgrading logic.
+    return NS_OK;
+  }
+
+  // Checking the database schema now
+  int32_t schemaVersion;
+  rv = mDBConn->GetSchemaVersion(&schemaVersion);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Changing the database?  Be sure to do these two things!
+  // 1) Increment DM_SCHEMA_VERSION
+  // 2) Implement the proper downgrade/upgrade code for the current version
+
+  switch (schemaVersion) {
+  // Upgrading
+  // Every time you increment the database schema, you need to implement
+  // the upgrading code from the previous version to the new one.
+  // Also, don't forget to make a unit test to test your upgrading code!
+  case 1: // Drop a column (iconURL) from the database (bug 385875)
+    {
+      // Safely wrap this in a transaction so we don't hose the whole DB
+      mozStorageTransaction safeTransaction(mDBConn, true);
+
+      // Create a temporary table that will store the existing records
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "CREATE TEMPORARY TABLE moz_downloads_backup ("
+          "id INTEGER PRIMARY KEY, "
+          "name TEXT, "
+          "source TEXT, "
+          "target TEXT, "
+          "startTime INTEGER, "
+          "endTime INTEGER, "
+          "state INTEGER"
+        ")"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Insert into a temporary table
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "INSERT INTO moz_downloads_backup "
+        "SELECT id, name, source, target, startTime, endTime, state "
+        "FROM moz_downloads"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Drop the old table
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "DROP TABLE moz_downloads"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Now recreate it with this schema version
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "CREATE TABLE moz_downloads ("
+          "id INTEGER PRIMARY KEY, "
+          "name TEXT, "
+          "source TEXT, "
+          "target TEXT, "
+          "startTime INTEGER, "
+          "endTime INTEGER, "
+          "state INTEGER"
+        ")"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Insert the data back into it
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "INSERT INTO moz_downloads "
+        "SELECT id, name, source, target, startTime, endTime, state "
+        "FROM moz_downloads_backup"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // And drop our temporary table
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "DROP TABLE moz_downloads_backup"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Finally, update the schemaVersion variable and the database schema
+      schemaVersion = 2;
+      rv = mDBConn->SetSchemaVersion(schemaVersion);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to the next upgrade
+    MOZ_FALLTHROUGH;
+
+  case 2: // Add referrer column to the database
+    {
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN referrer TEXT"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Finally, update the schemaVersion variable and the database schema
+      schemaVersion = 3;
+      rv = mDBConn->SetSchemaVersion(schemaVersion);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to the next upgrade
+    MOZ_FALLTHROUGH;
+
+  case 3: // This version adds a column to the database (entityID)
+    {
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN entityID TEXT"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Finally, update the schemaVersion variable and the database schema
+      schemaVersion = 4;
+      rv = mDBConn->SetSchemaVersion(schemaVersion);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to the next upgrade
+    MOZ_FALLTHROUGH;
+
+  case 4: // This version adds a column to the database (tempPath)
+    {
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN tempPath TEXT"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Finally, update the schemaVersion variable and the database schema
+      schemaVersion = 5;
+      rv = mDBConn->SetSchemaVersion(schemaVersion);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to the next upgrade
+    MOZ_FALLTHROUGH;
+
+  case 5: // This version adds two columns for tracking transfer progress
+    {
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN currBytes INTEGER NOT NULL DEFAULT 0"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN maxBytes INTEGER NOT NULL DEFAULT -1"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Finally, update the schemaVersion variable and the database schema
+      schemaVersion = 6;
+      rv = mDBConn->SetSchemaVersion(schemaVersion);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to the next upgrade
+    MOZ_FALLTHROUGH;
+
+  case 6: // This version adds three columns to DB (MIME type related info)
+    {
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN mimeType TEXT"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN preferredApplication TEXT"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN preferredAction INTEGER NOT NULL DEFAULT 0"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Finally, update the schemaVersion variable and the database schema
+      schemaVersion = 7;
+      rv = mDBConn->SetSchemaVersion(schemaVersion);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to next upgrade
+    MOZ_FALLTHROUGH;
+
+  case 7: // This version adds a column to remember to auto-resume downloads
+    {
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "ALTER TABLE moz_downloads "
+        "ADD COLUMN autoResume INTEGER NOT NULL DEFAULT 0"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Finally, update the schemaVersion variable and the database schema
+      schemaVersion = 8;
+      rv = mDBConn->SetSchemaVersion(schemaVersion);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to the next upgrade
+    MOZ_FALLTHROUGH;
+
+    // Warning: schema versions >=8 must take into account that they can
+    // be operating on schemas from unknown, future versions that have
+    // been downgraded. Operations such as adding columns may fail,
+    // since the column may already exist.
+
+  case 8: // This version adds a column for GUIDs
+    {
+      bool exists;
+      rv = mDBConn->IndexExists(NS_LITERAL_CSTRING("moz_downloads_guid_uniqueindex"),
+                                &exists);
+      NS_ENSURE_SUCCESS(rv, rv);
+      if (!exists) {
+        rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+          "ALTER TABLE moz_downloads ADD COLUMN guid TEXT"));
+        NS_ENSURE_SUCCESS(rv, rv);
+        rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+          "CREATE UNIQUE INDEX moz_downloads_guid_uniqueindex ON moz_downloads (guid)"));
+        NS_ENSURE_SUCCESS(rv, rv);
+      }
+
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "UPDATE moz_downloads SET guid = GENERATE_GUID() WHERE guid ISNULL"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Finally, update the database schema
+      schemaVersion = 9;
+      rv = mDBConn->SetSchemaVersion(schemaVersion);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to the next upgrade
+
+  // Extra sanity checking for developers
+#ifndef DEBUG
+    MOZ_FALLTHROUGH;
+  case DM_SCHEMA_VERSION:
+#endif
+    break;
+
+  case 0:
+    {
+      NS_WARNING("Could not get download database's schema version!");
+
+      // The table may still be usable - someone may have just messed with the
+      // schema version, so let's just treat this like a downgrade and verify
+      // that the needed columns are there.  If they aren't there, we'll drop
+      // the table anyway.
+      rv = mDBConn->SetSchemaVersion(DM_SCHEMA_VERSION);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    // Fallthrough to downgrade check
+    MOZ_FALLTHROUGH;
+
+  // Downgrading
+  // If columns have been added to the table, we can still use the ones we
+  // understand safely.  If columns have been deleted or alterd, we just
+  // drop the table and start from scratch.  If you change how a column
+  // should be interpreted, make sure you also change its name so this
+  // check will catch it.
+  default:
+    {
+      nsCOMPtr<mozIStorageStatement> stmt;
+      rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
+        "SELECT id, name, source, target, tempPath, startTime, endTime, state, "
+               "referrer, entityID, currBytes, maxBytes, mimeType, "
+               "preferredApplication, preferredAction, autoResume, guid "
+        "FROM moz_downloads"), getter_AddRefs(stmt));
+      if (NS_SUCCEEDED(rv)) {
+        // We have a database that contains all of the elements that make up
+        // the latest known schema. Reset the version to force an upgrade
+        // path if this downgraded database is used in a later version.
+        mDBConn->SetSchemaVersion(DM_SCHEMA_VERSION);
+        break;
+      }
+
+      // if the statement fails, that means all the columns were not there.
+      // First we backup the database
+      nsCOMPtr<mozIStorageService> storage =
+        do_GetService(MOZ_STORAGE_SERVICE_CONTRACTID);
+      NS_ENSURE_TRUE(storage, NS_ERROR_NOT_AVAILABLE);
+      nsCOMPtr<nsIFile> backup;
+      rv = storage->BackupDatabaseFile(dbFile, DM_DB_CORRUPT_FILENAME, nullptr,
+                                       getter_AddRefs(backup));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Then we dump it
+      rv = mDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+        "DROP TABLE moz_downloads"));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = CreateTable(mDBConn);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    break;
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::CreateTable(mozIStorageConnection* aDBConn)
+{
+  nsresult rv = aDBConn->SetSchemaVersion(DM_SCHEMA_VERSION);
+  if (NS_FAILED(rv)) return rv;
+
+  rv = aDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+    "CREATE TABLE moz_downloads ("
+      "id INTEGER PRIMARY KEY, "
+      "name TEXT, "
+      "source TEXT, "
+      "target TEXT, "
+      "tempPath TEXT, "
+      "startTime INTEGER, "
+      "endTime INTEGER, "
+      "state INTEGER, "
+      "referrer TEXT, "
+      "entityID TEXT, "
+      "currBytes INTEGER NOT NULL DEFAULT 0, "
+      "maxBytes INTEGER NOT NULL DEFAULT -1, "
+      "mimeType TEXT, "
+      "preferredApplication TEXT, "
+      "preferredAction INTEGER NOT NULL DEFAULT 0, "
+      "autoResume INTEGER NOT NULL DEFAULT 0, "
+      "guid TEXT"
+    ")"));
+  if (NS_FAILED(rv)) return rv;
+
+  rv = aDBConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+    "CREATE UNIQUE INDEX moz_downloads_guid_uniqueindex "
+      "ON moz_downloads(guid)"));
+  return rv;
+}
+
+nsresult
+nsDownloadManager::RestoreDatabaseState()
+{
+  // Restore downloads that were in a scanning state.  We can assume that they
+  // have been dealt with by the virus scanner
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "UPDATE moz_downloads "
+    "SET state = :state "
+    "WHERE state = :state_cond"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("state"), nsIDownloadManager::DOWNLOAD_FINISHED);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("state_cond"), nsIDownloadManager::DOWNLOAD_SCANNING);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->Execute();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Convert supposedly-active downloads into downloads that should auto-resume
+  rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "UPDATE moz_downloads "
+    "SET autoResume = :autoResume "
+    "WHERE state = :notStarted "
+      "OR state = :queued "
+      "OR state = :downloading"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("autoResume"), nsDownload::AUTO_RESUME);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("notStarted"), nsIDownloadManager::DOWNLOAD_NOTSTARTED);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("queued"), nsIDownloadManager::DOWNLOAD_QUEUED);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("downloading"), nsIDownloadManager::DOWNLOAD_DOWNLOADING);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->Execute();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Switch any download that is supposed to automatically resume and is in a
+  // finished state to *not* automatically resume.  See Bug 409179 for details.
+  rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "UPDATE moz_downloads "
+    "SET autoResume = :autoResume "
+    "WHERE state = :state "
+      "AND autoResume = :autoResume_cond"),
+    getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("autoResume"), nsDownload::DONT_RESUME);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("state"), nsIDownloadManager::DOWNLOAD_FINISHED);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("autoResume_cond"), nsDownload::AUTO_RESUME);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->Execute();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::RestoreActiveDownloads()
+{
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "SELECT id "
+    "FROM moz_downloads "
+    "WHERE (state = :state AND LENGTH(entityID) > 0) "
+      "OR autoResume != :autoResume"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("state"), nsIDownloadManager::DOWNLOAD_PAUSED);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("autoResume"), nsDownload::DONT_RESUME);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsresult retVal = NS_OK;
+  bool hasResults;
+  while (NS_SUCCEEDED(stmt->ExecuteStep(&hasResults)) && hasResults) {
+    RefPtr<nsDownload> dl;
+    // Keep trying to add even if we fail one, but make sure to return failure.
+    // Additionally, be careful to not call anything that tries to change the
+    // database because we're iterating over a live statement.
+    if (NS_FAILED(GetDownloadFromDB(stmt->AsInt32(0), getter_AddRefs(dl))) ||
+        NS_FAILED(AddToCurrentDownloads(dl)))
+      retVal = NS_ERROR_FAILURE;
+  }
+
+  // Try to resume only the downloads that should auto-resume
+  rv = ResumeAllDownloads(false);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return retVal;
+}
+
+int64_t
+nsDownloadManager::AddDownloadToDB(const nsAString &aName,
+                                   const nsACString &aSource,
+                                   const nsACString &aTarget,
+                                   const nsAString &aTempPath,
+                                   int64_t aStartTime,
+                                   int64_t aEndTime,
+                                   const nsACString &aMimeType,
+                                   const nsACString &aPreferredApp,
+                                   nsHandlerInfoAction aPreferredAction,
+                                   bool aPrivate,
+                                   nsACString& aNewGUID)
+{
+  mozIStorageConnection* dbConn = aPrivate ? mPrivateDBConn : mDBConn;
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = dbConn->CreateStatement(NS_LITERAL_CSTRING(
+    "INSERT INTO moz_downloads "
+    "(name, source, target, tempPath, startTime, endTime, state, "
+     "mimeType, preferredApplication, preferredAction, guid) VALUES "
+    "(:name, :source, :target, :tempPath, :startTime, :endTime, :state, "
+     ":mimeType, :preferredApplication, :preferredAction, :guid)"),
+    getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindStringByName(NS_LITERAL_CSTRING("name"), aName);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("source"), aSource);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("target"), aTarget);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindStringByName(NS_LITERAL_CSTRING("tempPath"), aTempPath);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("startTime"), aStartTime);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("endTime"), aEndTime);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("state"), nsIDownloadManager::DOWNLOAD_NOTSTARTED);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("mimeType"), aMimeType);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("preferredApplication"), aPreferredApp);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("preferredAction"), aPreferredAction);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  nsAutoCString guid;
+  rv = GenerateGUID(guid);
+  NS_ENSURE_SUCCESS(rv, 0);
+  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("guid"), guid);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  bool hasMore;
+  rv = stmt->ExecuteStep(&hasMore); // we want to keep our lock
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  int64_t id = 0;
+  rv = dbConn->GetLastInsertRowID(&id);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  aNewGUID = guid;
+
+  // lock on DB from statement will be released once we return
+  return id;
+}
+
+nsresult
+nsDownloadManager::InitDB()
+{
+  nsresult rv = InitPrivateDB();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = InitFileDB();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = InitStatements(mDBConn, getter_AddRefs(mUpdateDownloadStatement),
+                      getter_AddRefs(mGetIdsForURIStatement));
+  NS_ENSURE_SUCCESS(rv, rv);
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::InitStatements(mozIStorageConnection* aDBConn,
+                                  mozIStorageStatement** aUpdateStatement,
+                                  mozIStorageStatement** aGetIdsStatement)
+{
+  nsresult rv = aDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "UPDATE moz_downloads "
+    "SET tempPath = :tempPath, startTime = :startTime, endTime = :endTime, "
+      "state = :state, referrer = :referrer, entityID = :entityID, "
+      "currBytes = :currBytes, maxBytes = :maxBytes, autoResume = :autoResume "
+    "WHERE id = :id"), aUpdateStatement);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "SELECT guid "
+    "FROM moz_downloads "
+    "WHERE source = :source"), aGetIdsStatement);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::Init()
+{
+  nsresult rv;
+
+  nsCOMPtr<nsIStringBundleService> bundleService =
+    mozilla::services::GetStringBundleService();
+  if (!bundleService)
+    return NS_ERROR_FAILURE;
+
+  rv = bundleService->CreateBundle(DOWNLOAD_MANAGER_BUNDLE,
+                                   getter_AddRefs(mBundle));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+#if !defined(MOZ_JSDOWNLOADS)
+  // When MOZ_JSDOWNLOADS is undefined, we still check the preference that can
+  // be used to enable the JavaScript API during the migration process.
+  mUseJSTransfer = Preferences::GetBool(PREF_BD_USEJSTRANSFER, false);
+#else
+  mUseJSTransfer = true;
+#endif
+
+  if (mUseJSTransfer)
+    return NS_OK;
+
+  // Clean up any old downloads.rdf files from before Firefox 3
+  {
+    nsCOMPtr<nsIFile> oldDownloadsFile;
+    bool fileExists;
+    if (NS_SUCCEEDED(NS_GetSpecialDirectory(NS_APP_DOWNLOADS_50_FILE,
+          getter_AddRefs(oldDownloadsFile))) &&
+        NS_SUCCEEDED(oldDownloadsFile->Exists(&fileExists)) &&
+        fileExists) {
+      (void)oldDownloadsFile->Remove(false);
+    }
+  }
+
+  mObserverService = mozilla::services::GetObserverService();
+  if (!mObserverService)
+    return NS_ERROR_FAILURE;
+
+  rv = InitDB();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+#ifdef DOWNLOAD_SCANNER
+  mScanner = new nsDownloadScanner();
+  if (!mScanner)
+    return NS_ERROR_OUT_OF_MEMORY;
+  rv = mScanner->Init();
+  if (NS_FAILED(rv)) {
+    delete mScanner;
+    mScanner = nullptr;
+  }
+#endif
+
+  // Do things *after* initializing various download manager properties such as
+  // restoring downloads to a consistent state
+  rv = RestoreDatabaseState();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = RestoreActiveDownloads();
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "Failed to restore all active downloads");
+
+  nsCOMPtr<nsINavHistoryService> history =
+    do_GetService(NS_NAVHISTORYSERVICE_CONTRACTID);
+
+  (void)mObserverService->NotifyObservers(
+                                static_cast<nsIDownloadManager *>(this),
+                                "download-manager-initialized",
+                                nullptr);
+
+  // The following AddObserver calls must be the last lines in this function,
+  // because otherwise, this function may fail (and thus, this object would be not
+  // completely initialized), but the observerservice would still keep a reference
+  // to us and notify us about shutdown, which may cause crashes.
+  // failure to add an observer is not critical
+  (void)mObserverService->AddObserver(this, "quit-application", true);
+  (void)mObserverService->AddObserver(this, "quit-application-requested", true);
+  (void)mObserverService->AddObserver(this, "offline-requested", true);
+  (void)mObserverService->AddObserver(this, "sleep_notification", true);
+  (void)mObserverService->AddObserver(this, "wake_notification", true);
+  (void)mObserverService->AddObserver(this, "suspend_process_notification", true);
+  (void)mObserverService->AddObserver(this, "resume_process_notification", true);
+  (void)mObserverService->AddObserver(this, "profile-before-change", true);
+  (void)mObserverService->AddObserver(this, NS_IOSERVICE_GOING_OFFLINE_TOPIC, true);
+  (void)mObserverService->AddObserver(this, NS_IOSERVICE_OFFLINE_STATUS_TOPIC, true);
+  (void)mObserverService->AddObserver(this, "last-pb-context-exited", true);
+  (void)mObserverService->AddObserver(this, "last-pb-context-exiting", true);
+
+  if (history)
+    (void)history->AddObserver(this, true);
+
+  return NS_OK;
+}
+
+int32_t
+nsDownloadManager::GetRetentionBehavior()
+{
+  // We use 0 as the default, which is "remove when done"
+  nsresult rv;
+  nsCOMPtr<nsIPrefBranch> pref = do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  int32_t val;
+  rv = pref->GetIntPref(PREF_BDM_RETENTION, &val);
+  NS_ENSURE_SUCCESS(rv, 0);
+
+  // Allow the Downloads Panel to change the retention behavior.  We do this to
+  // allow proper migration to the new feature when using the same profile on
+  // multiple versions of the product (bug 697678).  Implementation note: in
+  // order to allow observers to change the retention value, we have to pass an
+  // object in the aSubject parameter, we cannot use aData for that.
+  nsCOMPtr<nsISupportsPRInt32> retentionBehavior =
+    do_CreateInstance(NS_SUPPORTS_PRINT32_CONTRACTID);
+  retentionBehavior->SetData(val);
+  (void)mObserverService->NotifyObservers(retentionBehavior,
+                                          "download-manager-change-retention",
+                                          nullptr);
+  retentionBehavior->GetData(&val);
+
+  return val;
+}
+
+enum nsDownloadManager::QuitBehavior
+nsDownloadManager::GetQuitBehavior()
+{
+  // We use 0 as the default, which is "remember and resume the download"
+  nsresult rv;
+  nsCOMPtr<nsIPrefBranch> pref = do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, QUIT_AND_RESUME);
+
+  int32_t val;
+  rv = pref->GetIntPref(PREF_BDM_QUITBEHAVIOR, &val);
+  NS_ENSURE_SUCCESS(rv, QUIT_AND_RESUME);
+
+  switch (val) {
+    case 1:
+      return QUIT_AND_PAUSE;
+    case 2:
+      return QUIT_AND_CANCEL;
+    default:
+      return QUIT_AND_RESUME;
+  }
+}
+
+// Using a globally-unique GUID, search all databases (both private and public).
+// A return value of NS_ERROR_NOT_AVAILABLE means no download with the given GUID
+// could be found, either private or public.
+
+nsresult
+nsDownloadManager::GetDownloadFromDB(const nsACString& aGUID, nsDownload **retVal)
+{
+  MOZ_ASSERT(!FindDownload(aGUID),
+             "If it is a current download, you should not call this method!");
+
+  NS_NAMED_LITERAL_CSTRING(query,
+    "SELECT id, state, startTime, source, target, tempPath, name, referrer, "
+           "entityID, currBytes, maxBytes, mimeType, preferredAction, "
+           "preferredApplication, autoResume, guid "
+    "FROM moz_downloads "
+    "WHERE guid = :guid");
+  // First, let's query the database and see if it even exists
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = mDBConn->CreateStatement(query, getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("guid"), aGUID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = GetDownloadFromDB(mDBConn, stmt, retVal);
+
+  // If the download cannot be found in the public database, try again
+  // in the private one. Otherwise, return whatever successful result
+  // or failure obtained from the public database.
+  if (rv == NS_ERROR_NOT_AVAILABLE) {
+    rv = mPrivateDBConn->CreateStatement(query, getter_AddRefs(stmt));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("guid"), aGUID);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = GetDownloadFromDB(mPrivateDBConn, stmt, retVal);
+
+    // Only if it still cannot be found do we report the failure.
+    if (rv == NS_ERROR_NOT_AVAILABLE) {
+      *retVal = nullptr;
+    }
+  }
+  return rv;
+}
+
+nsresult
+nsDownloadManager::GetDownloadFromDB(uint32_t aID, nsDownload **retVal)
+{
+  NS_WARNING("Using integer IDs without compat mode enabled");
+
+  MOZ_ASSERT(!FindDownload(aID),
+             "If it is a current download, you should not call this method!");
+
+  // First, let's query the database and see if it even exists
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "SELECT id, state, startTime, source, target, tempPath, name, referrer, "
+           "entityID, currBytes, maxBytes, mimeType, preferredAction, "
+           "preferredApplication, autoResume, guid "
+    "FROM moz_downloads "
+    "WHERE id = :id"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("id"), aID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return GetDownloadFromDB(mDBConn, stmt, retVal);
+}
+
+nsresult
+nsDownloadManager::GetDownloadFromDB(mozIStorageConnection* aDBConn,
+                                     mozIStorageStatement* stmt,
+                                     nsDownload **retVal)
+{
+  bool hasResults = false;
+  nsresult rv = stmt->ExecuteStep(&hasResults);
+  if (NS_FAILED(rv) || !hasResults)
+    return NS_ERROR_NOT_AVAILABLE;
+
+  // We have a download, so lets create it
+  RefPtr<nsDownload> dl = new nsDownload();
+  if (!dl)
+    return NS_ERROR_OUT_OF_MEMORY;
+  dl->mPrivate = aDBConn == mPrivateDBConn;
+
+  dl->mDownloadManager = this;
+
+  int32_t i = 0;
+  // Setting all properties of the download now
+  dl->mCancelable = nullptr;
+  dl->mID = stmt->AsInt64(i++);
+  dl->mDownloadState = stmt->AsInt32(i++);
+  dl->mStartTime = stmt->AsInt64(i++);
+
+  nsCString source;
+  stmt->GetUTF8String(i++, source);
+  rv = NS_NewURI(getter_AddRefs(dl->mSource), source);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCString target;
+  stmt->GetUTF8String(i++, target);
+  rv = NS_NewURI(getter_AddRefs(dl->mTarget), target);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsString tempPath;
+  stmt->GetString(i++, tempPath);
+  if (!tempPath.IsEmpty()) {
+    rv = NS_NewLocalFile(tempPath, true, getter_AddRefs(dl->mTempFile));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  stmt->GetString(i++, dl->mDisplayName);
+
+  nsCString referrer;
+  rv = stmt->GetUTF8String(i++, referrer);
+  if (NS_SUCCEEDED(rv) && !referrer.IsEmpty()) {
+    rv = NS_NewURI(getter_AddRefs(dl->mReferrer), referrer);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  rv = stmt->GetUTF8String(i++, dl->mEntityID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  int64_t currBytes = stmt->AsInt64(i++);
+  int64_t maxBytes = stmt->AsInt64(i++);
+  dl->SetProgressBytes(currBytes, maxBytes);
+
+  // Build mMIMEInfo only if the mimeType in DB is not empty
+  nsAutoCString mimeType;
+  rv = stmt->GetUTF8String(i++, mimeType);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!mimeType.IsEmpty()) {
+    nsCOMPtr<nsIMIMEService> mimeService =
+      do_GetService(NS_MIMESERVICE_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = mimeService->GetFromTypeAndExtension(mimeType, EmptyCString(),
+                                              getter_AddRefs(dl->mMIMEInfo));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsHandlerInfoAction action = stmt->AsInt32(i++);
+    rv = dl->mMIMEInfo->SetPreferredAction(action);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsAutoCString persistentDescriptor;
+    rv = stmt->GetUTF8String(i++, persistentDescriptor);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (!persistentDescriptor.IsEmpty()) {
+      nsCOMPtr<nsILocalHandlerApp> handler =
+        do_CreateInstance(NS_LOCALHANDLERAPP_CONTRACTID, &rv);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsCOMPtr<nsIFile> localExecutable;
+      rv = NS_NewNativeLocalFile(EmptyCString(), false,
+                                 getter_AddRefs(localExecutable));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = localExecutable->SetPersistentDescriptor(persistentDescriptor);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = handler->SetExecutable(localExecutable);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = dl->mMIMEInfo->SetPreferredApplicationHandler(handler);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  } else {
+    // Compensate for the i++s skipped in the true block
+    i += 2;
+  }
+
+  dl->mAutoResume =
+    static_cast<enum nsDownload::AutoResume>(stmt->AsInt32(i++));
+
+  rv = stmt->GetUTF8String(i++, dl->mGUID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Handle situations where we load a download from a database that has been
+  // used in an older version and not gone through the upgrade path (ie. it
+  // contains empty GUID entries).
+  if (dl->mGUID.IsEmpty()) {
+    rv = GenerateGUID(dl->mGUID);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr<mozIStorageStatement> updateStmt;
+    rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
+                                    "UPDATE moz_downloads SET guid = :guid "
+                                    "WHERE id = :id"),
+                                  getter_AddRefs(updateStmt));
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = updateStmt->BindUTF8StringByName(NS_LITERAL_CSTRING("guid"), dl->mGUID);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = updateStmt->BindInt64ByName(NS_LITERAL_CSTRING("id"), dl->mID);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = updateStmt->Execute();
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Addrefing and returning
+  dl.forget(retVal);
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::AddToCurrentDownloads(nsDownload *aDl)
+{
+  nsCOMArray<nsDownload>& currentDownloads =
+    aDl->mPrivate ? mCurrentPrivateDownloads : mCurrentDownloads;
+  if (!currentDownloads.AppendObject(aDl))
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  aDl->mDownloadManager = this;
+  return NS_OK;
+}
+
+void
+nsDownloadManager::SendEvent(nsDownload *aDownload, const char *aTopic)
+{
+  (void)mObserverService->NotifyObservers(aDownload, aTopic, nullptr);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsIDownloadManager
+
+NS_IMETHODIMP
+nsDownloadManager::GetActivePrivateDownloadCount(int32_t* aResult)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  *aResult = mCurrentPrivateDownloads.Count();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::GetActiveDownloadCount(int32_t *aResult)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  *aResult = mCurrentDownloads.Count();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::GetActiveDownloads(nsISimpleEnumerator **aResult)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  return NS_NewArrayEnumerator(aResult, mCurrentDownloads);
+}
+
+NS_IMETHODIMP
+nsDownloadManager::GetActivePrivateDownloads(nsISimpleEnumerator **aResult)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  return NS_NewArrayEnumerator(aResult, mCurrentPrivateDownloads);
+}
+
+/**
+ * For platforms where helper apps use the downloads directory (i.e. mobile),
+ * this should be kept in sync with nsExternalHelperAppService.cpp
+ */
+NS_IMETHODIMP
+nsDownloadManager::GetDefaultDownloadsDirectory(nsIFile **aResult)
+{
+  nsCOMPtr<nsIFile> downloadDir;
+
+  nsresult rv;
+  nsCOMPtr<nsIProperties> dirService =
+     do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // OSX 10.4:
+  // Desktop
+  // OSX 10.5:
+  // User download directory
+  // Vista:
+  // Downloads
+  // XP/2K:
+  // My Documents/Downloads
+  // Linux:
+  // XDG user dir spec, with a fallback to Home/Downloads
+
+  nsXPIDLString folderName;
+  mBundle->GetStringFromName(u"downloadsFolder",
+                             getter_Copies(folderName));
+
+#if defined (XP_MACOSX)
+  rv = dirService->Get(NS_OSX_DEFAULT_DOWNLOAD_DIR,
+                       NS_GET_IID(nsIFile),
+                       getter_AddRefs(downloadDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+#elif defined(XP_WIN)
+  rv = dirService->Get(NS_WIN_DEFAULT_DOWNLOAD_DIR,
+                       NS_GET_IID(nsIFile),
+                       getter_AddRefs(downloadDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Check the os version
+  nsCOMPtr<nsIPropertyBag2> infoService =
+     do_GetService(NS_SYSTEMINFO_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  int32_t version;
+  NS_NAMED_LITERAL_STRING(osVersion, "version");
+  rv = infoService->GetPropertyAsInt32(osVersion, &version);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (version < 6) { // XP/2K
+    // First get "My Documents"
+    rv = dirService->Get(NS_WIN_PERSONAL_DIR,
+                         NS_GET_IID(nsIFile),
+                         getter_AddRefs(downloadDir));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = downloadDir->Append(folderName);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // This could be the first time we are creating the downloads folder in My
+    // Documents, so make sure it exists.
+    bool exists;
+    rv = downloadDir->Exists(&exists);
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (!exists) {
+      rv = downloadDir->Create(nsIFile::DIRECTORY_TYPE, 0755);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  }
+#elif defined(XP_UNIX)
+#if defined(MOZ_WIDGET_ANDROID)
+    // Android doesn't have a $HOME directory, and by default we only have
+    // write access to /data/data/org.mozilla.{$APP} and /sdcard
+    char* downloadDirPath = getenv("DOWNLOADS_DIRECTORY");
+    if (downloadDirPath) {
+      rv = NS_NewNativeLocalFile(nsDependentCString(downloadDirPath),
+                                 true, getter_AddRefs(downloadDir));
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    else {
+      rv = NS_ERROR_FAILURE;
+    }
+#else
+  rv = dirService->Get(NS_UNIX_DEFAULT_DOWNLOAD_DIR,
+                       NS_GET_IID(nsIFile),
+                       getter_AddRefs(downloadDir));
+  // fallback to Home/Downloads
+  if (NS_FAILED(rv)) {
+    rv = dirService->Get(NS_UNIX_HOME_DIR,
+                         NS_GET_IID(nsIFile),
+                         getter_AddRefs(downloadDir));
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = downloadDir->Append(folderName);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+#endif
+#else
+  rv = dirService->Get(NS_OS_HOME_DIR,
+                       NS_GET_IID(nsIFile),
+                       getter_AddRefs(downloadDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = downloadDir->Append(folderName);
+  NS_ENSURE_SUCCESS(rv, rv);
+#endif
+
+  downloadDir.forget(aResult);
+
+  return NS_OK;
+}
+
+#define NS_BRANCH_DOWNLOAD     "browser.download."
+#define NS_PREF_FOLDERLIST     "folderList"
+#define NS_PREF_DIR            "dir"
+
+NS_IMETHODIMP
+nsDownloadManager::GetUserDownloadsDirectory(nsIFile **aResult)
+{
+  nsresult rv;
+  nsCOMPtr<nsIProperties> dirService =
+     do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIPrefService> prefService =
+     do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIPrefBranch> prefBranch;
+  rv = prefService->GetBranch(NS_BRANCH_DOWNLOAD,
+                              getter_AddRefs(prefBranch));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  int32_t val;
+  rv = prefBranch->GetIntPref(NS_PREF_FOLDERLIST,
+                              &val);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  switch(val) {
+    case 0: // Desktop
+      {
+        nsCOMPtr<nsIFile> downloadDir;
+        rv = dirService->Get(NS_OS_DESKTOP_DIR,
+                             NS_GET_IID(nsIFile),
+                             getter_AddRefs(downloadDir));
+        NS_ENSURE_SUCCESS(rv, rv);
+        downloadDir.forget(aResult);
+        return NS_OK;
+      }
+      break;
+    case 1: // Downloads
+      return GetDefaultDownloadsDirectory(aResult);
+    case 2: // Custom
+      {
+        nsCOMPtr<nsIFile> customDirectory;
+        prefBranch->GetComplexValue(NS_PREF_DIR,
+                                    NS_GET_IID(nsIFile),
+                                    getter_AddRefs(customDirectory));
+        if (customDirectory) {
+          bool exists = false;
+          (void)customDirectory->Exists(&exists);
+
+          if (!exists) {
+            rv = customDirectory->Create(nsIFile::DIRECTORY_TYPE, 0755);
+            if (NS_SUCCEEDED(rv)) {
+              customDirectory.forget(aResult);
+              return NS_OK;
+            }
+
+            // Create failed, so it still doesn't exist.  Fall out and get the
+            // default downloads directory.
+          }
+
+          bool writable = false;
+          bool directory = false;
+          (void)customDirectory->IsWritable(&writable);
+          (void)customDirectory->IsDirectory(&directory);
+
+          if (exists && writable && directory) {
+            customDirectory.forget(aResult);
+            return NS_OK;
+          }
+        }
+        rv = GetDefaultDownloadsDirectory(aResult);
+        if (NS_SUCCEEDED(rv)) {
+          (void)prefBranch->SetComplexValue(NS_PREF_DIR,
+                                            NS_GET_IID(nsIFile),
+                                            *aResult);
+        }
+        return rv;
+      }
+      break;
+  }
+  return NS_ERROR_INVALID_ARG;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::AddDownload(DownloadType aDownloadType,
+                               nsIURI *aSource,
+                               nsIURI *aTarget,
+                               const nsAString& aDisplayName,
+                               nsIMIMEInfo *aMIMEInfo,
+                               PRTime aStartTime,
+                               nsIFile *aTempFile,
+                               nsICancelable *aCancelable,
+                               bool aIsPrivate,
+                               nsIDownload **aDownload)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_ENSURE_ARG_POINTER(aSource);
+  NS_ENSURE_ARG_POINTER(aTarget);
+  NS_ENSURE_ARG_POINTER(aDownload);
+
+  nsresult rv;
+
+  // target must be on the local filesystem
+  nsCOMPtr<nsIFileURL> targetFileURL = do_QueryInterface(aTarget, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> targetFile;
+  rv = targetFileURL->GetFile(getter_AddRefs(targetFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  RefPtr<nsDownload> dl = new nsDownload();
+  if (!dl)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  // give our new nsIDownload some info so it's ready to go off into the world
+  dl->mTarget = aTarget;
+  dl->mSource = aSource;
+  dl->mTempFile = aTempFile;
+  dl->mPrivate = aIsPrivate;
+
+  dl->mDisplayName = aDisplayName;
+  if (dl->mDisplayName.IsEmpty())
+    targetFile->GetLeafName(dl->mDisplayName);
+
+  dl->mMIMEInfo = aMIMEInfo;
+  dl->SetStartTime(aStartTime == 0 ? PR_Now() : aStartTime);
+
+  // Creates a cycle that will be broken when the download finishes
+  dl->mCancelable = aCancelable;
+
+  // Adding to the DB
+  nsAutoCString source, target;
+  rv = aSource->GetSpec(source);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aTarget->GetSpec(target);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Track the temp file for exthandler downloads
+  nsAutoString tempPath;
+  if (aTempFile)
+    aTempFile->GetPath(tempPath);
+
+  // Break down MIMEInfo but don't panic if we can't get all the pieces - we
+  // can still download the file
+  nsAutoCString persistentDescriptor, mimeType;
+  nsHandlerInfoAction action = nsIMIMEInfo::saveToDisk;
+  if (aMIMEInfo) {
+    (void)aMIMEInfo->GetType(mimeType);
+
+    nsCOMPtr<nsIHandlerApp> handlerApp;
+    (void)aMIMEInfo->GetPreferredApplicationHandler(getter_AddRefs(handlerApp));
+    nsCOMPtr<nsILocalHandlerApp> locHandlerApp = do_QueryInterface(handlerApp);
+
+    if (locHandlerApp) {
+      nsCOMPtr<nsIFile> executable;
+      (void)locHandlerApp->GetExecutable(getter_AddRefs(executable));
+      Unused << executable->GetPersistentDescriptor(persistentDescriptor);
+    }
+
+    (void)aMIMEInfo->GetPreferredAction(&action);
+  }
+
+  int64_t id = AddDownloadToDB(dl->mDisplayName, source, target, tempPath,
+                               dl->mStartTime, dl->mLastUpdate,
+                               mimeType, persistentDescriptor, action,
+                               dl->mPrivate, dl->mGUID /* outparam */);
+  NS_ENSURE_TRUE(id, NS_ERROR_FAILURE);
+  dl->mID = id;
+
+  rv = AddToCurrentDownloads(dl);
+  (void)dl->SetState(nsIDownloadManager::DOWNLOAD_QUEUED);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+#ifdef DOWNLOAD_SCANNER
+  if (mScanner) {
+    bool scan = true;
+    nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
+    if (prefs) {
+      (void)prefs->GetBoolPref(PREF_BDM_SCANWHENDONE, &scan);
+    }
+    // We currently apply local security policy to downloads when we scan
+    // via windows all-in-one download security api. The CheckPolicy call
+    // below is a pre-emptive part of that process. So tie applying security
+    // zone policy settings when downloads are intiated to the same pref
+    // that triggers applying security zone policy settings after a download
+    // completes. (bug 504804)
+    if (scan) {
+      AVCheckPolicyState res = mScanner->CheckPolicy(aSource, aTarget);
+      if (res == AVPOLICY_BLOCKED) {
+        // This download will get deleted during a call to IAE's Save,
+        // so go ahead and mark it as blocked and avoid the download.
+        (void)CancelDownload(id);
+        (void)dl->SetState(nsIDownloadManager::DOWNLOAD_BLOCKED_POLICY);
+      }
+    }
+  }
+#endif
+
+  // Check with parental controls to see if file downloads
+  // are allowed for this user. If not allowed, cancel the
+  // download and mark its state as being blocked.
+  nsCOMPtr<nsIParentalControlsService> pc =
+    do_CreateInstance(NS_PARENTALCONTROLSSERVICE_CONTRACTID);
+  if (pc) {
+    bool enabled = false;
+    (void)pc->GetBlockFileDownloadsEnabled(&enabled);
+    if (enabled) {
+      (void)CancelDownload(id);
+      (void)dl->SetState(nsIDownloadManager::DOWNLOAD_BLOCKED_PARENTAL);
+    }
+
+    // Log the event if required by pc settings.
+    bool logEnabled = false;
+    (void)pc->GetLoggingEnabled(&logEnabled);
+    if (logEnabled) {
+      (void)pc->Log(nsIParentalControlsService::ePCLog_FileDownload,
+                    enabled,
+                    aSource,
+                    nullptr);
+    }
+  }
+
+  dl.forget(aDownload);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::GetDownload(uint32_t aID, nsIDownload **aDownloadItem)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_WARNING("Using integer IDs without compat mode enabled");
+
+  nsDownload *itm = FindDownload(aID);
+
+  RefPtr<nsDownload> dl;
+  if (!itm) {
+    nsresult rv = GetDownloadFromDB(aID, getter_AddRefs(dl));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    itm = dl.get();
+  }
+
+  NS_ADDREF(*aDownloadItem = itm);
+
+  return NS_OK;
+}
+
+namespace {
+class AsyncResult : public Runnable
+{
+public:
+  AsyncResult(nsresult aStatus, nsIDownload* aResult,
+              nsIDownloadManagerResult* aCallback)
+  : mStatus(aStatus), mResult(aResult), mCallback(aCallback)
+  {
+  }
+
+  NS_IMETHOD Run() override
+  {
+    mCallback->HandleResult(mStatus, mResult);
+    return NS_OK;
+  }
+
+private:
+  nsresult mStatus;
+  nsCOMPtr<nsIDownload> mResult;
+  nsCOMPtr<nsIDownloadManagerResult> mCallback;
+};
+} // namespace
+
+NS_IMETHODIMP
+nsDownloadManager::GetDownloadByGUID(const nsACString& aGUID,
+                                     nsIDownloadManagerResult* aCallback)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  nsDownload *itm = FindDownload(aGUID);
+
+  nsresult rv = NS_OK;
+  RefPtr<nsDownload> dl;
+  if (!itm) {
+    rv = GetDownloadFromDB(aGUID, getter_AddRefs(dl));
+    itm = dl.get();
+  }
+
+  RefPtr<AsyncResult> runnable = new AsyncResult(rv, itm, aCallback);
+  NS_DispatchToMainThread(runnable);
+  return NS_OK;
+}
+
+nsDownload *
+nsDownloadManager::FindDownload(uint32_t aID)
+{
+  // we shouldn't ever have many downloads, so we can loop over them
+  for (int32_t i = mCurrentDownloads.Count() - 1; i >= 0; --i) {
+    nsDownload *dl = mCurrentDownloads[i];
+    if (dl->mID == aID)
+      return dl;
+  }
+
+  return nullptr;
+}
+
+nsDownload *
+nsDownloadManager::FindDownload(const nsACString& aGUID)
+{
+  // we shouldn't ever have many downloads, so we can loop over them
+  for (int32_t i = mCurrentDownloads.Count() - 1; i >= 0; --i) {
+    nsDownload *dl = mCurrentDownloads[i];
+    if (dl->mGUID == aGUID)
+      return dl;
+  }
+
+  for (int32_t i = mCurrentPrivateDownloads.Count() - 1; i >= 0; --i) {
+    nsDownload *dl = mCurrentPrivateDownloads[i];
+    if (dl->mGUID == aGUID)
+      return dl;
+  }
+
+  return nullptr;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::CancelDownload(uint32_t aID)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_WARNING("Using integer IDs without compat mode enabled");
+
+  // We AddRef here so we don't lose access to member variables when we remove
+  RefPtr<nsDownload> dl = FindDownload(aID);
+
+  // if it's null, someone passed us a bad id.
+  if (!dl)
+    return NS_ERROR_FAILURE;
+
+  return dl->Cancel();
+}
+
+nsresult
+nsDownloadManager::RetryDownload(const nsACString& aGUID)
+{
+  RefPtr<nsDownload> dl;
+  nsresult rv = GetDownloadFromDB(aGUID, getter_AddRefs(dl));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return RetryDownload(dl);
+}
+
+NS_IMETHODIMP
+nsDownloadManager::RetryDownload(uint32_t aID)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_WARNING("Using integer IDs without compat mode enabled");
+
+  RefPtr<nsDownload> dl;
+  nsresult rv = GetDownloadFromDB(aID, getter_AddRefs(dl));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return RetryDownload(dl);
+}
+
+nsresult
+nsDownloadManager::RetryDownload(nsDownload* dl)
+{
+  // if our download is not canceled or failed, we should fail
+  if (dl->mDownloadState != nsIDownloadManager::DOWNLOAD_FAILED &&
+      dl->mDownloadState != nsIDownloadManager::DOWNLOAD_BLOCKED_PARENTAL &&
+      dl->mDownloadState != nsIDownloadManager::DOWNLOAD_BLOCKED_POLICY &&
+      dl->mDownloadState != nsIDownloadManager::DOWNLOAD_DIRTY &&
+      dl->mDownloadState != nsIDownloadManager::DOWNLOAD_CANCELED)
+    return NS_ERROR_FAILURE;
+
+  // If the download has failed and is resumable then we first try resuming it
+  nsresult rv;
+  if (dl->mDownloadState == nsIDownloadManager::DOWNLOAD_FAILED && dl->IsResumable()) {
+    rv = dl->Resume();
+    if (NS_SUCCEEDED(rv))
+      return rv;
+  }
+
+  // reset time and download progress
+  dl->SetStartTime(PR_Now());
+  dl->SetProgressBytes(0, -1);
+
+  nsCOMPtr<nsIWebBrowserPersist> wbp =
+    do_CreateInstance("@mozilla.org/embedding/browser/nsWebBrowserPersist;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = wbp->SetPersistFlags(nsIWebBrowserPersist::PERSIST_FLAGS_REPLACE_EXISTING_FILES |
+                            nsIWebBrowserPersist::PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = AddToCurrentDownloads(dl);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = dl->SetState(nsIDownloadManager::DOWNLOAD_QUEUED);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Creates a cycle that will be broken when the download finishes
+  dl->mCancelable = wbp;
+  (void)wbp->SetProgressListener(dl);
+
+  // referrer policy can be anything since referrer is nullptr
+  rv = wbp->SavePrivacyAwareURI(dl->mSource, nullptr,
+                                nullptr, mozilla::net::RP_Default,
+                                nullptr, nullptr,
+                                dl->mTarget, dl->mPrivate);
+  if (NS_FAILED(rv)) {
+    dl->mCancelable = nullptr;
+    (void)wbp->SetProgressListener(nullptr);
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+static nsresult
+RemoveDownloadByGUID(const nsACString& aGUID, mozIStorageConnection* aDBConn)
+{
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = aDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "DELETE FROM moz_downloads "
+    "WHERE guid = :guid"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("guid"), aGUID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->Execute();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return NS_OK;
+}
+
+nsresult
+nsDownloadManager::RemoveDownload(const nsACString& aGUID)
+{
+  RefPtr<nsDownload> dl = FindDownload(aGUID);
+  MOZ_ASSERT(!dl, "Can't call RemoveDownload on a download in progress!");
+  if (dl)
+    return NS_ERROR_FAILURE;
+
+  nsresult rv = GetDownloadFromDB(aGUID, getter_AddRefs(dl));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (dl->mPrivate) {
+    RemoveDownloadByGUID(aGUID, mPrivateDBConn);
+  } else {
+    RemoveDownloadByGUID(aGUID, mDBConn);
+  }
+
+  return NotifyDownloadRemoval(dl);
+}
+
+NS_IMETHODIMP
+nsDownloadManager::RemoveDownload(uint32_t aID)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_WARNING("Using integer IDs without compat mode enabled");
+
+  RefPtr<nsDownload> dl = FindDownload(aID);
+  MOZ_ASSERT(!dl, "Can't call RemoveDownload on a download in progress!");
+  if (dl)
+    return NS_ERROR_FAILURE;
+
+  nsresult rv = GetDownloadFromDB(aID, getter_AddRefs(dl));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<mozIStorageStatement> stmt;
+  rv = mDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "DELETE FROM moz_downloads "
+    "WHERE id = :id"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("id"), aID); // unsigned; 64-bit to prevent overflow
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->Execute();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Notify the UI with the topic and download id
+  return NotifyDownloadRemoval(dl);
+}
+
+nsresult
+nsDownloadManager::NotifyDownloadRemoval(nsDownload* aRemoved)
+{
+  nsCOMPtr<nsISupportsPRUint32> id;
+  nsCOMPtr<nsISupportsCString> guid;
+  nsresult rv;
+
+  // Only send an integer ID notification if the download is public.
+  bool sendDeprecatedNotification = !(aRemoved && aRemoved->mPrivate);
+
+  if (sendDeprecatedNotification && aRemoved) {
+    id = do_CreateInstance(NS_SUPPORTS_PRUINT32_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    uint32_t dlID;
+    rv = aRemoved->GetId(&dlID);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = id->SetData(dlID);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  if (sendDeprecatedNotification) {
+    mObserverService->NotifyObservers(id,
+                                     "download-manager-remove-download",
+                                     nullptr);
+  }
+
+  if (aRemoved) {
+    guid = do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsAutoCString guidStr;
+    rv = aRemoved->GetGuid(guidStr);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = guid->SetData(guidStr);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  mObserverService->NotifyObservers(guid,
+                                    "download-manager-remove-download-guid",
+                                    nullptr);
+  return NS_OK;
+}
+
+static nsresult
+DoRemoveDownloadsByTimeframe(mozIStorageConnection* aDBConn,
+                             int64_t aStartTime,
+                             int64_t aEndTime)
+{
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = aDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "DELETE FROM moz_downloads "
+    "WHERE startTime >= :startTime "
+    "AND startTime <= :endTime "
+    "AND state NOT IN (:downloading, :paused, :queued)"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Bind the times
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("startTime"), aStartTime);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("endTime"), aEndTime);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Bind the active states
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("downloading"), nsIDownloadManager::DOWNLOAD_DOWNLOADING);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("paused"), nsIDownloadManager::DOWNLOAD_PAUSED);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("queued"), nsIDownloadManager::DOWNLOAD_QUEUED);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Execute
+  rv = stmt->Execute();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::RemoveDownloadsByTimeframe(int64_t aStartTime,
+                                              int64_t aEndTime)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  nsresult rv = DoRemoveDownloadsByTimeframe(mDBConn, aStartTime, aEndTime);
+  nsresult rv2 = DoRemoveDownloadsByTimeframe(mPrivateDBConn, aStartTime, aEndTime);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_SUCCESS(rv2, rv2);
+
+  // Notify the UI with the topic and null subject to indicate "remove multiple"
+  return NotifyDownloadRemoval(nullptr);
+}
+
+NS_IMETHODIMP
+nsDownloadManager::CleanUp()
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  return CleanUp(mDBConn);
+}
+
+NS_IMETHODIMP
+nsDownloadManager::CleanUpPrivate()
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  return CleanUp(mPrivateDBConn);
+}
+
+nsresult
+nsDownloadManager::CleanUp(mozIStorageConnection* aDBConn)
+{
+  DownloadState states[] = { nsIDownloadManager::DOWNLOAD_FINISHED,
+                             nsIDownloadManager::DOWNLOAD_FAILED,
+                             nsIDownloadManager::DOWNLOAD_CANCELED,
+                             nsIDownloadManager::DOWNLOAD_BLOCKED_PARENTAL,
+                             nsIDownloadManager::DOWNLOAD_BLOCKED_POLICY,
+                             nsIDownloadManager::DOWNLOAD_DIRTY };
+
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = aDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "DELETE FROM moz_downloads "
+    "WHERE state = ? "
+      "OR state = ? "
+      "OR state = ? "
+      "OR state = ? "
+      "OR state = ? "
+      "OR state = ?"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, rv);
+  for (uint32_t i = 0; i < ArrayLength(states); ++i) {
+    rv = stmt->BindInt32ByIndex(i, states[i]);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  rv = stmt->Execute();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Notify the UI with the topic and null subject to indicate "remove multiple"
+  return NotifyDownloadRemoval(nullptr);
+}
+
+static nsresult
+DoGetCanCleanUp(mozIStorageConnection* aDBConn, bool *aResult)
+{
+  // This method should never return anything but NS_OK for the benefit of
+  // unwitting consumers.
+  
+  *aResult = false;
+
+  DownloadState states[] = { nsIDownloadManager::DOWNLOAD_FINISHED,
+                             nsIDownloadManager::DOWNLOAD_FAILED,
+                             nsIDownloadManager::DOWNLOAD_CANCELED,
+                             nsIDownloadManager::DOWNLOAD_BLOCKED_PARENTAL,
+                             nsIDownloadManager::DOWNLOAD_BLOCKED_POLICY,
+                             nsIDownloadManager::DOWNLOAD_DIRTY };
+
+  nsCOMPtr<mozIStorageStatement> stmt;
+  nsresult rv = aDBConn->CreateStatement(NS_LITERAL_CSTRING(
+    "SELECT COUNT(*) "
+    "FROM moz_downloads "
+    "WHERE state = ? "
+      "OR state = ? "
+      "OR state = ? "
+      "OR state = ? "
+      "OR state = ? "
+      "OR state = ?"), getter_AddRefs(stmt));
+  NS_ENSURE_SUCCESS(rv, NS_OK);
+  for (uint32_t i = 0; i < ArrayLength(states); ++i) {
+    rv = stmt->BindInt32ByIndex(i, states[i]);
+    NS_ENSURE_SUCCESS(rv, NS_OK);
+  }
+
+  bool moreResults; // We don't really care...
+  rv = stmt->ExecuteStep(&moreResults);
+  NS_ENSURE_SUCCESS(rv, NS_OK);
+
+  int32_t count;
+  rv = stmt->GetInt32(0, &count);
+  NS_ENSURE_SUCCESS(rv, NS_OK);
+
+  if (count > 0)
+    *aResult = true;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::GetCanCleanUp(bool *aResult)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  return DoGetCanCleanUp(mDBConn, aResult);
+}
+
+NS_IMETHODIMP
+nsDownloadManager::GetCanCleanUpPrivate(bool *aResult)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  return DoGetCanCleanUp(mPrivateDBConn, aResult);
+}
+
+NS_IMETHODIMP
+nsDownloadManager::PauseDownload(uint32_t aID)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_WARNING("Using integer IDs without compat mode enabled");
+
+  nsDownload *dl = FindDownload(aID);
+  if (!dl)
+    return NS_ERROR_FAILURE;
+
+  return dl->Pause();
+}
+
+NS_IMETHODIMP
+nsDownloadManager::ResumeDownload(uint32_t aID)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_WARNING("Using integer IDs without compat mode enabled");
+
+  nsDownload *dl = FindDownload(aID);
+  if (!dl)
+    return NS_ERROR_FAILURE;
+
+  return dl->Resume();
+}
+
+NS_IMETHODIMP
+nsDownloadManager::GetDBConnection(mozIStorageConnection **aDBConn)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_ADDREF(*aDBConn = mDBConn);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::GetPrivateDBConnection(mozIStorageConnection **aDBConn)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  NS_ADDREF(*aDBConn = mPrivateDBConn);
+
+  return NS_OK;
+ }
+
+NS_IMETHODIMP
+nsDownloadManager::AddListener(nsIDownloadProgressListener *aListener)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  mListeners.AppendObject(aListener);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::AddPrivacyAwareListener(nsIDownloadProgressListener *aListener)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  mPrivacyAwareListeners.AppendObject(aListener);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::RemoveListener(nsIDownloadProgressListener *aListener)
+{
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  mListeners.RemoveObject(aListener);
+  mPrivacyAwareListeners.RemoveObject(aListener);
+  return NS_OK;
+}
+
+void
+nsDownloadManager::NotifyListenersOnDownloadStateChange(int16_t aOldState,
+                                                        nsDownload *aDownload)
+{
+  for (int32_t i = mPrivacyAwareListeners.Count() - 1; i >= 0; --i) {
+    mPrivacyAwareListeners[i]->OnDownloadStateChange(aOldState, aDownload);
+  }
+
+  // Only privacy-aware listeners should receive notifications about private
+  // downloads, while non-privacy-aware listeners receive no sign they exist.
+  if (aDownload->mPrivate) {
+    return;
+  }
+
+  for (int32_t i = mListeners.Count() - 1; i >= 0; --i) {
+    mListeners[i]->OnDownloadStateChange(aOldState, aDownload);
+  }
+}
+
+void
+nsDownloadManager::NotifyListenersOnProgressChange(nsIWebProgress *aProgress,
+                                                   nsIRequest *aRequest,
+                                                   int64_t aCurSelfProgress,
+                                                   int64_t aMaxSelfProgress,
+                                                   int64_t aCurTotalProgress,
+                                                   int64_t aMaxTotalProgress,
+                                                   nsDownload *aDownload)
+{
+  for (int32_t i = mPrivacyAwareListeners.Count() - 1; i >= 0; --i) {
+    mPrivacyAwareListeners[i]->OnProgressChange(aProgress, aRequest, aCurSelfProgress,
+                                                aMaxSelfProgress, aCurTotalProgress,
+                                                aMaxTotalProgress, aDownload);
+  }
+
+  // Only privacy-aware listeners should receive notifications about private
+  // downloads, while non-privacy-aware listeners receive no sign they exist.
+  if (aDownload->mPrivate) {
+    return;
+  }
+
+  for (int32_t i = mListeners.Count() - 1; i >= 0; --i) {
+    mListeners[i]->OnProgressChange(aProgress, aRequest, aCurSelfProgress,
+                                    aMaxSelfProgress, aCurTotalProgress,
+                                    aMaxTotalProgress, aDownload);
+  }
+}
+
+void
+nsDownloadManager::NotifyListenersOnStateChange(nsIWebProgress *aProgress,
+                                                nsIRequest *aRequest,
+                                                uint32_t aStateFlags,
+                                                nsresult aStatus,
+                                                nsDownload *aDownload)
+{
+  for (int32_t i = mPrivacyAwareListeners.Count() - 1; i >= 0; --i) {
+    mPrivacyAwareListeners[i]->OnStateChange(aProgress, aRequest, aStateFlags, aStatus,
+                                             aDownload);
+  }
+
+  // Only privacy-aware listeners should receive notifications about private
+  // downloads, while non-privacy-aware listeners receive no sign they exist.
+  if (aDownload->mPrivate) {
+    return;
+  }
+
+  for (int32_t i = mListeners.Count() - 1; i >= 0; --i) {
+    mListeners[i]->OnStateChange(aProgress, aRequest, aStateFlags, aStatus,
+                                 aDownload);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsINavHistoryObserver
+
+NS_IMETHODIMP
+nsDownloadManager::OnBeginUpdateBatch()
+{
+  // This method in not normally invoked when mUseJSTransfer is enabled, however
+  // we provide an extra check in case it is called manually by add-ons.
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  // We already have a transaction, so don't make another
+  if (mHistoryTransaction)
+    return NS_OK;
+
+  // Start a transaction that commits when deleted
+  mHistoryTransaction = new mozStorageTransaction(mDBConn, true);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnEndUpdateBatch()
+{
+  // Get rid of the transaction and cause it to commit
+  mHistoryTransaction = nullptr;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnVisit(nsIURI *aURI, int64_t aVisitID, PRTime aTime,
+                           int64_t aSessionID, int64_t aReferringID,
+                           uint32_t aTransitionType, const nsACString& aGUID,
+                           bool aHidden, uint32_t aVisitCount, uint32_t aTyped)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnTitleChanged(nsIURI *aURI,
+                                  const nsAString &aPageTitle,
+                                  const nsACString &aGUID)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnFrecencyChanged(nsIURI* aURI,
+                                     int32_t aNewFrecency,
+                                     const nsACString& aGUID,
+                                     bool aHidden,
+                                     PRTime aLastVisitDate)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnManyFrecenciesChanged()
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnDeleteURI(nsIURI *aURI,
+                               const nsACString& aGUID,
+                               uint16_t aReason)
+{
+  // This method in not normally invoked when mUseJSTransfer is enabled, however
+  // we provide an extra check in case it is called manually by add-ons.
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  nsresult rv = RemoveDownloadsForURI(mGetIdsForURIStatement, aURI);
+  nsresult rv2 = RemoveDownloadsForURI(mGetPrivateIdsForURIStatement, aURI);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_SUCCESS(rv2, rv2);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnClearHistory()
+{
+  return CleanUp();
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnPageChanged(nsIURI *aURI,
+                                 uint32_t aChangedAttribute,
+                                 const nsAString& aNewValue,
+                                 const nsACString &aGUID)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownloadManager::OnDeleteVisits(nsIURI *aURI, PRTime aVisitTime,
+                                  const nsACString& aGUID,
+                                  uint16_t aReason, uint32_t aTransitionType)
+{
+  // Don't bother removing downloads until the page is removed.
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsIObserver
+
+NS_IMETHODIMP
+nsDownloadManager::Observe(nsISupports *aSubject,
+                           const char *aTopic,
+                           const char16_t *aData)
+{
+  // This method in not normally invoked when mUseJSTransfer is enabled, however
+  // we provide an extra check in case it is called manually by add-ons.
+  NS_ENSURE_STATE(!mUseJSTransfer);
+
+  // We need to count the active public downloads that could be lost
+  // by quitting, and add any active private ones as well, since per-window
+  // private browsing may be active.
+  int32_t currDownloadCount = mCurrentDownloads.Count();
+
+  // If we don't need to cancel all the downloads on quit, only count the ones
+  // that aren't resumable.
+  if (GetQuitBehavior() != QUIT_AND_CANCEL) {
+    for (int32_t i = currDownloadCount - 1; i >= 0; --i) {
+      if (mCurrentDownloads[i]->IsResumable()) {
+        currDownloadCount--;
+      }
+    }
+
+    // We have a count of the public, non-resumable downloads. Now we need
+    // to add the total number of private downloads, since they are in danger
+    // of being lost.
+    currDownloadCount += mCurrentPrivateDownloads.Count();
+  }
+
+  nsresult rv;
+  if (strcmp(aTopic, "oncancel") == 0) {
+    nsCOMPtr<nsIDownload> dl = do_QueryInterface(aSubject, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    dl->Cancel();
+  } else if (strcmp(aTopic, "profile-before-change") == 0) {
+    CloseAllDBs();
+  } else if (strcmp(aTopic, "quit-application") == 0) {
+    // Try to pause all downloads and, if appropriate, mark them as auto-resume
+    // unless user has specified that downloads should be canceled
+    enum QuitBehavior behavior = GetQuitBehavior();
+    if (behavior != QUIT_AND_CANCEL)
+      (void)PauseAllDownloads(bool(behavior != QUIT_AND_PAUSE));
+
+    // Remove downloads to break cycles and cancel downloads
+    (void)RemoveAllDownloads();
+
+   // Now that active downloads have been canceled, remove all completed or
+   // aborted downloads if the user's retention policy specifies it.
+    if (GetRetentionBehavior() == 1)
+      CleanUp();
+  } else if (strcmp(aTopic, "quit-application-requested") == 0 &&
+             currDownloadCount) {
+    nsCOMPtr<nsISupportsPRBool> cancelDownloads =
+      do_QueryInterface(aSubject, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+#ifndef XP_MACOSX
+    ConfirmCancelDownloads(currDownloadCount, cancelDownloads,
+                           u"quitCancelDownloadsAlertTitle",
+                           u"quitCancelDownloadsAlertMsgMultiple",
+                           u"quitCancelDownloadsAlertMsg",
+                           u"dontQuitButtonWin");
+#else
+    ConfirmCancelDownloads(currDownloadCount, cancelDownloads,
+                           u"quitCancelDownloadsAlertTitle",
+                           u"quitCancelDownloadsAlertMsgMacMultiple",
+                           u"quitCancelDownloadsAlertMsgMac",
+                           u"dontQuitButtonMac");
+#endif
+  } else if (strcmp(aTopic, "offline-requested") == 0 && currDownloadCount) {
+    nsCOMPtr<nsISupportsPRBool> cancelDownloads =
+      do_QueryInterface(aSubject, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    ConfirmCancelDownloads(currDownloadCount, cancelDownloads,
+                           u"offlineCancelDownloadsAlertTitle",
+                           u"offlineCancelDownloadsAlertMsgMultiple",
+                           u"offlineCancelDownloadsAlertMsg",
+                           u"dontGoOfflineButton");
+  }
+  else if (strcmp(aTopic, NS_IOSERVICE_GOING_OFFLINE_TOPIC) == 0) {
+    // Pause all downloads, and mark them to auto-resume.
+    (void)PauseAllDownloads(true);
+  }
+  else if (strcmp(aTopic, NS_IOSERVICE_OFFLINE_STATUS_TOPIC) == 0 &&
+           nsDependentString(aData).EqualsLiteral(NS_IOSERVICE_ONLINE)) {
+    // We can now resume all downloads that are supposed to auto-resume.
+    (void)ResumeAllDownloads(false);
+  }
+  else if (strcmp(aTopic, "alertclickcallback") == 0) {
+    nsCOMPtr<nsIDownloadManagerUI> dmui =
+      do_GetService("@mozilla.org/download-manager-ui;1", &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    return dmui->Show(nullptr, nullptr, nsIDownloadManagerUI::REASON_USER_INTERACTED,
+                      aData && NS_strcmp(aData, u"private") == 0);
+  } else if (strcmp(aTopic, "sleep_notification") == 0 ||
+             strcmp(aTopic, "suspend_process_notification") == 0) {
+    // Pause downloads if we're sleeping, and mark the downloads as auto-resume
+    (void)PauseAllDownloads(true);
+  } else if (strcmp(aTopic, "wake_notification") == 0 ||
+             strcmp(aTopic, "resume_process_notification") == 0) {
+    int32_t resumeOnWakeDelay = 10000;
+    nsCOMPtr<nsIPrefBranch> pref = do_GetService(NS_PREFSERVICE_CONTRACTID);
+    if (pref)
+      (void)pref->GetIntPref(PREF_BDM_RESUMEONWAKEDELAY, &resumeOnWakeDelay);
+
+    // Wait a little bit before trying to resume to avoid resuming when network
+    // connections haven't restarted yet
+    mResumeOnWakeTimer = do_CreateInstance("@mozilla.org/timer;1");
+    if (resumeOnWakeDelay >= 0 && mResumeOnWakeTimer) {
+      (void)mResumeOnWakeTimer->InitWithFuncCallback(ResumeOnWakeCallback,
+        this, resumeOnWakeDelay, nsITimer::TYPE_ONE_SHOT);
+    }
+  } else if (strcmp(aTopic, "last-pb-context-exited") == 0) {
+    // Upon leaving private browsing mode, cancel all private downloads,
+    // remove all trace of them, and then blow away the private database
+    // and recreate a blank one.
+    RemoveAllDownloads(mCurrentPrivateDownloads);
+    InitPrivateDB();
+  } else if (strcmp(aTopic, "last-pb-context-exiting") == 0) {
+    // If there are active private downloads, prompt the user to confirm leaving
+    // private browsing mode (thereby cancelling them). Otherwise, silently proceed.
+    if (!mCurrentPrivateDownloads.Count())
+      return NS_OK;
+
+    nsCOMPtr<nsISupportsPRBool> cancelDownloads = do_QueryInterface(aSubject, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    ConfirmCancelDownloads(mCurrentPrivateDownloads.Count(), cancelDownloads,
+                           u"leavePrivateBrowsingCancelDownloadsAlertTitle",
+                           u"leavePrivateBrowsingWindowsCancelDownloadsAlertMsgMultiple2",
+                           u"leavePrivateBrowsingWindowsCancelDownloadsAlertMsg2",
+                           u"dontLeavePrivateBrowsingButton2");
+  }
+
+  return NS_OK;
+}
+
+void
+nsDownloadManager::ConfirmCancelDownloads(int32_t aCount,
+                                          nsISupportsPRBool *aCancelDownloads,
+                                          const char16_t *aTitle,
+                                          const char16_t *aCancelMessageMultiple,
+                                          const char16_t *aCancelMessageSingle,
+                                          const char16_t *aDontCancelButton)
+{
+  // If user has already dismissed quit request, then do nothing
+  bool quitRequestCancelled = false;
+  aCancelDownloads->GetData(&quitRequestCancelled);
+  if (quitRequestCancelled)
+    return;
+
+  nsXPIDLString title, message, quitButton, dontQuitButton;
+
+  mBundle->GetStringFromName(aTitle, getter_Copies(title));
+
+  nsAutoString countString;
+  countString.AppendInt(aCount);
+  const char16_t *strings[1] = { countString.get() };
+  if (aCount > 1) {
+    mBundle->FormatStringFromName(aCancelMessageMultiple, strings, 1,
+                                  getter_Copies(message));
+    mBundle->FormatStringFromName(u"cancelDownloadsOKTextMultiple",
+                                  strings, 1, getter_Copies(quitButton));
+  } else {
+    mBundle->GetStringFromName(aCancelMessageSingle, getter_Copies(message));
+    mBundle->GetStringFromName(u"cancelDownloadsOKText",
+                               getter_Copies(quitButton));
+  }
+
+  mBundle->GetStringFromName(aDontCancelButton, getter_Copies(dontQuitButton));
+
+  // Get Download Manager window, to be parent of alert.
+  nsCOMPtr<nsIWindowMediator> wm = do_GetService(NS_WINDOWMEDIATOR_CONTRACTID);
+  nsCOMPtr<mozIDOMWindowProxy> dmWindow;
+  if (wm) {
+    wm->GetMostRecentWindow(u"Download:Manager",
+                            getter_AddRefs(dmWindow));
+  }
+
+  // Show alert.
+  nsCOMPtr<nsIPromptService> prompter(do_GetService(NS_PROMPTSERVICE_CONTRACTID));
+  if (prompter) {
+    int32_t flags = (nsIPromptService::BUTTON_TITLE_IS_STRING * nsIPromptService::BUTTON_POS_0) + (nsIPromptService::BUTTON_TITLE_IS_STRING * nsIPromptService::BUTTON_POS_1);
+    bool nothing = false;
+    int32_t button;
+    prompter->ConfirmEx(dmWindow, title, message, flags, quitButton.get(), dontQuitButton.get(), nullptr, nullptr, &nothing, &button);
+
+    aCancelDownloads->SetData(button == 1);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsDownload
+
+NS_IMPL_CLASSINFO(nsDownload, nullptr, 0, NS_DOWNLOAD_CID)
+NS_IMPL_ISUPPORTS_CI(
+    nsDownload
+  , nsIDownload
+  , nsITransfer
+  , nsIWebProgressListener
+  , nsIWebProgressListener2
+)
+
+nsDownload::nsDownload() : mDownloadState(nsIDownloadManager::DOWNLOAD_NOTSTARTED),
+                           mID(0),
+                           mPercentComplete(0),
+                           mCurrBytes(0),
+                           mMaxBytes(-1),
+                           mStartTime(0),
+                           mLastUpdate(PR_Now() - (uint32_t)gUpdateInterval),
+                           mResumedAt(-1),
+                           mSpeed(0),
+                           mHasMultipleFiles(false),
+                           mPrivate(false),
+                           mAutoResume(DONT_RESUME)
+{
+}
+
+nsDownload::~nsDownload()
+{
+}
+
+NS_IMETHODIMP nsDownload::SetSha256Hash(const nsACString& aHash) {
+  MOZ_ASSERT(NS_IsMainThread(), "Must call SetSha256Hash on main thread");
+  // This will be used later to query the application reputation service.
+  mHash = aHash;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsDownload::SetSignatureInfo(nsIArray* aSignatureInfo) {
+  MOZ_ASSERT(NS_IsMainThread(), "Must call SetSignatureInfo on main thread");
+  // This will be used later to query the application reputation service.
+  mSignatureInfo = aSignatureInfo;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsDownload::SetRedirects(nsIArray* aRedirects) {
+  MOZ_ASSERT(NS_IsMainThread(), "Must call SetRedirects on main thread");
+  // This will be used later to query the application reputation service.
+  mRedirects = aRedirects;
+  return NS_OK;
+}
+
+#ifdef MOZ_ENABLE_GIO
+static void gio_set_metadata_done(GObject *source_obj, GAsyncResult *res, gpointer user_data)
+{
+  GError *err = nullptr;
+  g_file_set_attributes_finish(G_FILE(source_obj), res, nullptr, &err);
+  if (err) {
+#ifdef DEBUG
+    NS_DebugBreak(NS_DEBUG_WARNING, "Set file metadata failed: ", err->message, __FILE__, __LINE__);
+#endif
+    g_error_free(err);
+  }
+}
+#endif
+
+nsresult
+nsDownload::SetState(DownloadState aState)
+{
+  NS_ASSERTION(mDownloadState != aState,
+               "Trying to set the download state to what it already is set to!");
+
+  int16_t oldState = mDownloadState;
+  mDownloadState = aState;
+
+  // We don't want to lose access to our member variables
+  RefPtr<nsDownload> kungFuDeathGrip = this;
+
+  // When the state changed listener is dispatched, queries to the database and
+  // the download manager api should reflect what the nsIDownload object would
+  // return. So, if a download is done (finished, canceled, etc.), it should
+  // first be removed from the current downloads.  We will also have to update
+  // the database *before* notifying listeners.  At this point, you can safely
+  // dispatch to the observers as well.
+  switch (aState) {
+    case nsIDownloadManager::DOWNLOAD_BLOCKED_PARENTAL:
+    case nsIDownloadManager::DOWNLOAD_BLOCKED_POLICY:
+    case nsIDownloadManager::DOWNLOAD_DIRTY:
+    case nsIDownloadManager::DOWNLOAD_CANCELED:
+    case nsIDownloadManager::DOWNLOAD_FAILED:
+#ifdef ANDROID
+      // If we still have a temp file, remove it
+      bool tempExists;
+      if (mTempFile && NS_SUCCEEDED(mTempFile->Exists(&tempExists)) && tempExists) {
+        nsresult rv = mTempFile->Remove(false);
+        NS_ENSURE_SUCCESS(rv, rv);
+      }
+#endif
+
+      // Transfers are finished, so break the reference cycle
+      Finalize();
+      break;
+#ifdef DOWNLOAD_SCANNER
+    case nsIDownloadManager::DOWNLOAD_SCANNING:
+    {
+      nsresult rv = mDownloadManager->mScanner ? mDownloadManager->mScanner->ScanDownload(this) : NS_ERROR_NOT_INITIALIZED;
+      // If we failed, then fall through to 'download finished'
+      if (NS_SUCCEEDED(rv))
+        break;
+      mDownloadState = aState = nsIDownloadManager::DOWNLOAD_FINISHED;
+    }
+#endif
+    case nsIDownloadManager::DOWNLOAD_FINISHED:
+    {
+      nsresult rv = ExecuteDesiredAction();
+      if (NS_FAILED(rv)) {
+        // We've failed to execute the desired action.  As a result, we should
+        // fail the download so the user can try again.
+        (void)FailDownload(rv, nullptr);
+        return rv;
+      }
+
+      // Now that we're done with handling the download, clean it up
+      Finalize();
+
+      nsCOMPtr<nsIPrefBranch> pref(do_GetService(NS_PREFSERVICE_CONTRACTID));
+
+      // Master pref to control this function.
+      bool showTaskbarAlert = true;
+      if (pref)
+        pref->GetBoolPref(PREF_BDM_SHOWALERTONCOMPLETE, &showTaskbarAlert);
+
+      if (showTaskbarAlert) {
+        int32_t alertInterval = 2000;
+        if (pref)
+          pref->GetIntPref(PREF_BDM_SHOWALERTINTERVAL, &alertInterval);
+
+        int64_t alertIntervalUSec = alertInterval * PR_USEC_PER_MSEC;
+        int64_t goat = PR_Now() - mStartTime;
+        showTaskbarAlert = goat > alertIntervalUSec;
+
+        int32_t size = mPrivate ?
+            mDownloadManager->mCurrentPrivateDownloads.Count() :
+            mDownloadManager->mCurrentDownloads.Count();
+        if (showTaskbarAlert && size == 0) {
+          nsCOMPtr<nsIAlertsService> alerts =
+            do_GetService("@mozilla.org/alerts-service;1");
+          if (alerts) {
+              nsXPIDLString title, message;
+
+              mDownloadManager->mBundle->GetStringFromName(
+                  u"downloadsCompleteTitle",
+                  getter_Copies(title));
+              mDownloadManager->mBundle->GetStringFromName(
+                  u"downloadsCompleteMsg",
+                  getter_Copies(message));
+
+              bool removeWhenDone =
+                mDownloadManager->GetRetentionBehavior() == 0;
+
+              // If downloads are automatically removed per the user's
+              // retention policy, there's no reason to make the text clickable
+              // because if it is, they'll click open the download manager and
+              // the items they downloaded will have been removed.
+              alerts->ShowAlertNotification(
+                  NS_LITERAL_STRING(DOWNLOAD_MANAGER_ALERT_ICON), title,
+                  message, !removeWhenDone,
+                  mPrivate ? NS_LITERAL_STRING("private") : NS_LITERAL_STRING("non-private"),
+                  mDownloadManager, EmptyString(), NS_LITERAL_STRING("auto"),
+                  EmptyString(), EmptyString(), nullptr, mPrivate,
+                  false /* requireInteraction */);
+            }
+        }
+      }
+
+#if defined(XP_WIN) || defined(XP_MACOSX) || defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_GTK)
+      nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(mTarget);
+      nsCOMPtr<nsIFile> file;
+      nsAutoString path;
+
+      if (fileURL &&
+          NS_SUCCEEDED(fileURL->GetFile(getter_AddRefs(file))) &&
+          file &&
+          NS_SUCCEEDED(file->GetPath(path))) {
+
+#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK) || defined(MOZ_WIDGET_ANDROID)
+        // On Windows and Gtk, add the download to the system's "recent documents"
+        // list, with a pref to disable.
+        {
+          bool addToRecentDocs = true;
+          if (pref)
+            pref->GetBoolPref(PREF_BDM_ADDTORECENTDOCS, &addToRecentDocs);
+#ifdef MOZ_WIDGET_ANDROID
+          if (addToRecentDocs) {
+            nsCOMPtr<nsIMIMEInfo> mimeInfo;
+            nsAutoCString contentType;
+            GetMIMEInfo(getter_AddRefs(mimeInfo));
+
+            if (mimeInfo)
+              mimeInfo->GetMIMEType(contentType);
+
+            if (jni::IsFennec()) {
+                java::DownloadsIntegration::ScanMedia(path, NS_ConvertUTF8toUTF16(contentType));
+            }
+          }
+#else
+          if (addToRecentDocs && !mPrivate) {
+#ifdef XP_WIN
+            ::SHAddToRecentDocs(SHARD_PATHW, path.get());
+#elif defined(MOZ_WIDGET_GTK)
+            GtkRecentManager* manager = gtk_recent_manager_get_default();
+
+            gchar* uri = g_filename_to_uri(NS_ConvertUTF16toUTF8(path).get(),
+                                           nullptr, nullptr);
+            if (uri) {
+              gtk_recent_manager_add_item(manager, uri);
+              g_free(uri);
+            }
+#endif
+          }
+#endif
+#ifdef MOZ_ENABLE_GIO
+          // Use GIO to store the source URI for later display in the file manager.
+          GFile* gio_file = g_file_new_for_path(NS_ConvertUTF16toUTF8(path).get());
+          nsCString source_uri;
+          rv = mSource->GetSpec(source_uri);
+          NS_ENSURE_SUCCESS(rv, rv);
+          GFileInfo *file_info = g_file_info_new();
+          g_file_info_set_attribute_string(file_info, "metadata::download-uri", source_uri.get());
+          g_file_set_attributes_async(gio_file,
+                                      file_info,
+                                      G_FILE_QUERY_INFO_NONE,
+                                      G_PRIORITY_DEFAULT,
+                                      nullptr, gio_set_metadata_done, nullptr);
+          g_object_unref(file_info);
+          g_object_unref(gio_file);
+#endif
+        }
+#endif
+
+#ifdef XP_MACOSX
+        // On OS X, make the downloads stack bounce.
+        CFStringRef observedObject = ::CFStringCreateWithCString(kCFAllocatorDefault,
+                                                 NS_ConvertUTF16toUTF8(path).get(),
+                                                 kCFStringEncodingUTF8);
+        CFNotificationCenterRef center = ::CFNotificationCenterGetDistributedCenter();
+        ::CFNotificationCenterPostNotification(center, CFSTR("com.apple.DownloadFileFinished"),
+                                               observedObject, nullptr, TRUE);
+        ::CFRelease(observedObject);
+#endif
+      }
+
+#ifdef XP_WIN
+      // Adjust file attributes so that by default, new files are indexed
+      // by desktop search services. Skip off those that land in the temp
+      // folder.
+      nsCOMPtr<nsIFile> tempDir, fileDir;
+      rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(tempDir));
+      NS_ENSURE_SUCCESS(rv, rv);
+      (void)file->GetParent(getter_AddRefs(fileDir));
+
+      bool isTemp = false;
+      if (fileDir)
+        (void)fileDir->Equals(tempDir, &isTemp);
+
+      nsCOMPtr<nsILocalFileWin> localFileWin(do_QueryInterface(file));
+      if (!isTemp && localFileWin)
+        (void)localFileWin->SetFileAttributesWin(nsILocalFileWin::WFA_SEARCH_INDEXED);
+#endif
+
+#endif
+      // Now remove the download if the user's retention policy is "Remove when Done"
+      if (mDownloadManager->GetRetentionBehavior() == 0)
+        mDownloadManager->RemoveDownload(mGUID);
+    }
+    break;
+  default:
+    break;
+  }
+
+  // Before notifying the listener, we must update the database so that calls
+  // to it work out properly.
+  nsresult rv = UpdateDB();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mDownloadManager->NotifyListenersOnDownloadStateChange(oldState, this);
+
+  switch (mDownloadState) {
+    case nsIDownloadManager::DOWNLOAD_DOWNLOADING:
+      // Only send the dl-start event to downloads that are actually starting.
+      if (oldState == nsIDownloadManager::DOWNLOAD_QUEUED) {
+        if (!mPrivate)
+          mDownloadManager->SendEvent(this, "dl-start");
+      }
+      break;
+    case nsIDownloadManager::DOWNLOAD_FAILED:
+      if (!mPrivate)
+        mDownloadManager->SendEvent(this, "dl-failed");
+      break;
+    case nsIDownloadManager::DOWNLOAD_SCANNING:
+      if (!mPrivate)
+        mDownloadManager->SendEvent(this, "dl-scanning");
+      break;
+    case nsIDownloadManager::DOWNLOAD_FINISHED:
+      if (!mPrivate)
+        mDownloadManager->SendEvent(this, "dl-done");
+      break;
+    case nsIDownloadManager::DOWNLOAD_BLOCKED_PARENTAL:
+    case nsIDownloadManager::DOWNLOAD_BLOCKED_POLICY:
+      if (!mPrivate)
+        mDownloadManager->SendEvent(this, "dl-blocked");
+      break;
+    case nsIDownloadManager::DOWNLOAD_DIRTY:
+      if (!mPrivate)
+        mDownloadManager->SendEvent(this, "dl-dirty");
+      break;
+    case nsIDownloadManager::DOWNLOAD_CANCELED:
+      if (!mPrivate)
+        mDownloadManager->SendEvent(this, "dl-cancel");
+      break;
+    default:
+      break;
+  }
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsIWebProgressListener2
+
+NS_IMETHODIMP
+nsDownload::OnProgressChange64(nsIWebProgress *aWebProgress,
+                               nsIRequest *aRequest,
+                               int64_t aCurSelfProgress,
+                               int64_t aMaxSelfProgress,
+                               int64_t aCurTotalProgress,
+                               int64_t aMaxTotalProgress)
+{
+  if (!mRequest)
+    mRequest = aRequest; // used for pause/resume
+
+  if (mDownloadState == nsIDownloadManager::DOWNLOAD_QUEUED) {
+    // Obtain the referrer
+    nsresult rv;
+    nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
+    nsCOMPtr<nsIURI> referrer = mReferrer;
+    if (channel)
+      (void)NS_GetReferrerFromChannel(channel, getter_AddRefs(mReferrer));
+
+    // Restore the original referrer if the new one isn't useful
+    if (!mReferrer)
+      mReferrer = referrer;
+
+    // If we have a MIME info, we know that exthandler has already added this to
+    // the history, but if we do not, we'll have to add it ourselves.
+    if (!mMIMEInfo && !mPrivate) {
+      nsCOMPtr<nsIDownloadHistory> dh =
+        do_GetService(NS_DOWNLOADHISTORY_CONTRACTID);
+      if (dh)
+        (void)dh->AddDownload(mSource, mReferrer, mStartTime, mTarget);
+    }
+
+    // Fetch the entityID, but if we can't get it, don't panic (non-resumable)
+    nsCOMPtr<nsIResumableChannel> resumableChannel(do_QueryInterface(aRequest));
+    if (resumableChannel)
+      (void)resumableChannel->GetEntityID(mEntityID);
+
+    // Before we update the state and dispatch state notifications, we want to
+    // ensure that we have the correct state for this download with regards to
+    // its percent completion and size.
+    SetProgressBytes(0, aMaxTotalProgress);
+
+    // Update the state and the database
+    rv = SetState(nsIDownloadManager::DOWNLOAD_DOWNLOADING);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // filter notifications since they come in so frequently
+  PRTime now = PR_Now();
+  PRIntervalTime delta = now - mLastUpdate;
+  if (delta < gUpdateInterval)
+    return NS_OK;
+
+  mLastUpdate = now;
+
+  // Calculate the speed using the elapsed delta time and bytes downloaded
+  // during that time for more accuracy.
+  double elapsedSecs = double(delta) / PR_USEC_PER_SEC;
+  if (elapsedSecs > 0) {
+    double speed = double(aCurTotalProgress - mCurrBytes) / elapsedSecs;
+    if (mCurrBytes == 0) {
+      mSpeed = speed;
+    } else {
+      // Calculate 'smoothed average' of 10 readings.
+      mSpeed = mSpeed * 0.9 + speed * 0.1;
+    }
+  }
+
+  SetProgressBytes(aCurTotalProgress, aMaxTotalProgress);
+
+  // Report to the listener our real sizes
+  int64_t currBytes, maxBytes;
+  (void)GetAmountTransferred(&currBytes);
+  (void)GetSize(&maxBytes);
+  mDownloadManager->NotifyListenersOnProgressChange(
+    aWebProgress, aRequest, currBytes, maxBytes, currBytes, maxBytes, this);
+
+  // If the maximums are different, then there must be more than one file
+  if (aMaxSelfProgress != aMaxTotalProgress)
+    mHasMultipleFiles = true;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::OnRefreshAttempted(nsIWebProgress *aWebProgress,
+                               nsIURI *aUri,
+                               int32_t aDelay,
+                               bool aSameUri,
+                               bool *allowRefresh)
+{
+  *allowRefresh = true;
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsIWebProgressListener
+
+NS_IMETHODIMP
+nsDownload::OnProgressChange(nsIWebProgress *aWebProgress,
+                             nsIRequest *aRequest,
+                             int32_t aCurSelfProgress,
+                             int32_t aMaxSelfProgress,
+                             int32_t aCurTotalProgress,
+                             int32_t aMaxTotalProgress)
+{
+  return OnProgressChange64(aWebProgress, aRequest,
+                            aCurSelfProgress, aMaxSelfProgress,
+                            aCurTotalProgress, aMaxTotalProgress);
+}
+
+NS_IMETHODIMP
+nsDownload::OnLocationChange(nsIWebProgress *aWebProgress,
+                             nsIRequest *aRequest, nsIURI *aLocation,
+                             uint32_t aFlags)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::OnStatusChange(nsIWebProgress *aWebProgress,
+                           nsIRequest *aRequest, nsresult aStatus,
+                           const char16_t *aMessage)
+{
+  if (NS_FAILED(aStatus))
+    return FailDownload(aStatus, aMessage);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::OnStateChange(nsIWebProgress *aWebProgress,
+                          nsIRequest *aRequest, uint32_t aStateFlags,
+                          nsresult aStatus)
+{
+  MOZ_ASSERT(NS_IsMainThread(), "Must call OnStateChange in main thread");
+
+  // We don't want to lose access to our member variables
+  RefPtr<nsDownload> kungFuDeathGrip = this;
+
+  // Check if we're starting a request; the NETWORK flag is necessary to not
+  // pick up the START of *each* file but only for the whole request
+  if ((aStateFlags & STATE_START) && (aStateFlags & STATE_IS_NETWORK)) {
+    nsresult rv;
+    nsCOMPtr<nsIHttpChannel> channel = do_QueryInterface(aRequest, &rv);
+    if (NS_SUCCEEDED(rv)) {
+      uint32_t status;
+      rv = channel->GetResponseStatus(&status);
+      // HTTP 450 - Blocked by parental control proxies
+      if (NS_SUCCEEDED(rv) && status == 450) {
+        // Cancel using the provided object
+        (void)Cancel();
+
+        // Fail the download
+        (void)SetState(nsIDownloadManager::DOWNLOAD_BLOCKED_PARENTAL);
+      }
+    }
+  } else if ((aStateFlags & STATE_STOP) && (aStateFlags & STATE_IS_NETWORK) &&
+             IsFinishable()) {
+    // We got both STOP and NETWORK so that means the whole request is done
+    // (and not just a single file if there are multiple files)
+    if (NS_SUCCEEDED(aStatus)) {
+      // We can't completely trust the bytes we've added up because we might be
+      // missing on some/all of the progress updates (especially from cache).
+      // Our best bet is the file itself, but if for some reason it's gone or
+      // if we have multiple files, the next best is what we've calculated.
+      int64_t fileSize;
+      nsCOMPtr<nsIFile> file;
+      //  We need a nsIFile clone to deal with file size caching issues. :(
+      nsCOMPtr<nsIFile> clone;
+      if (!mHasMultipleFiles &&
+          NS_SUCCEEDED(GetTargetFile(getter_AddRefs(file))) &&
+          NS_SUCCEEDED(file->Clone(getter_AddRefs(clone))) &&
+          NS_SUCCEEDED(clone->GetFileSize(&fileSize)) && fileSize > 0) {
+        mCurrBytes = mMaxBytes = fileSize;
+
+        // If we resumed, keep the fact that we did and fix size calculations
+        if (WasResumed())
+          mResumedAt = 0;
+      } else if (mMaxBytes == -1) {
+        mMaxBytes = mCurrBytes;
+      } else {
+        mCurrBytes = mMaxBytes;
+      }
+
+      mPercentComplete = 100;
+      mLastUpdate = PR_Now();
+
+#ifdef DOWNLOAD_SCANNER
+      bool scan = true;
+      nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
+      if (prefs)
+        (void)prefs->GetBoolPref(PREF_BDM_SCANWHENDONE, &scan);
+
+      if (scan)
+        (void)SetState(nsIDownloadManager::DOWNLOAD_SCANNING);
+      else
+        (void)SetState(nsIDownloadManager::DOWNLOAD_FINISHED);
+#else
+      (void)SetState(nsIDownloadManager::DOWNLOAD_FINISHED);
+#endif
+    } else {
+      // We failed for some unknown reason -- fail with a generic message
+      (void)FailDownload(aStatus, nullptr);
+    }
+  }
+
+  mDownloadManager->NotifyListenersOnStateChange(aWebProgress, aRequest,
+                                                 aStateFlags, aStatus, this);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::OnSecurityChange(nsIWebProgress *aWebProgress,
+                             nsIRequest *aRequest, uint32_t aState)
+{
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsIDownload
+
+NS_IMETHODIMP
+nsDownload::Init(nsIURI *aSource,
+                 nsIURI *aTarget,
+                 const nsAString& aDisplayName,
+                 nsIMIMEInfo *aMIMEInfo,
+                 PRTime aStartTime,
+                 nsIFile *aTempFile,
+                 nsICancelable *aCancelable,
+                 bool aIsPrivate)
+{
+  NS_WARNING("Huh...how did we get here?!");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetState(int16_t *aState)
+{
+  *aState = mDownloadState;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetDisplayName(nsAString &aDisplayName)
+{
+  aDisplayName = mDisplayName;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetCancelable(nsICancelable **aCancelable)
+{
+  *aCancelable = mCancelable;
+  NS_IF_ADDREF(*aCancelable);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetTarget(nsIURI **aTarget)
+{
+  *aTarget = mTarget;
+  NS_IF_ADDREF(*aTarget);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetSource(nsIURI **aSource)
+{
+  *aSource = mSource;
+  NS_IF_ADDREF(*aSource);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetStartTime(int64_t *aStartTime)
+{
+  *aStartTime = mStartTime;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetPercentComplete(int32_t *aPercentComplete)
+{
+  *aPercentComplete = mPercentComplete;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetAmountTransferred(int64_t *aAmountTransferred)
+{
+  *aAmountTransferred = mCurrBytes + (WasResumed() ? mResumedAt : 0);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetSize(int64_t *aSize)
+{
+  *aSize = mMaxBytes + (WasResumed() && mMaxBytes != -1 ? mResumedAt : 0);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetMIMEInfo(nsIMIMEInfo **aMIMEInfo)
+{
+  *aMIMEInfo = mMIMEInfo;
+  NS_IF_ADDREF(*aMIMEInfo);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetTargetFile(nsIFile **aTargetFile)
+{
+  nsresult rv;
+
+  nsCOMPtr<nsIFileURL> fileURL = do_QueryInterface(mTarget, &rv);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIFile> file;
+  rv = fileURL->GetFile(getter_AddRefs(file));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  file.forget(aTargetFile);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsDownload::GetSpeed(double *aSpeed)
+{
+  *aSpeed = mSpeed;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetId(uint32_t *aId)
+{
+  if (mPrivate) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  *aId = mID;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetGuid(nsACString &aGUID)
+{
+  aGUID = mGUID;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetReferrer(nsIURI **referrer)
+{
+  NS_IF_ADDREF(*referrer = mReferrer);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetResumable(bool *resumable)
+{
+  *resumable = IsResumable();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::GetIsPrivate(bool *isPrivate)
+{
+  *isPrivate = mPrivate;
+  return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//// nsDownload Helper Functions
+
+void
+nsDownload::Finalize()
+{
+  // We're stopping, so break the cycle we created at download start
+  mCancelable = nullptr;
+
+  // Reset values that aren't needed anymore, so the DB can be updated as well
+  mEntityID.Truncate();
+  mTempFile = nullptr;
+
+  // Remove ourself from the active downloads
+  nsCOMArray<nsDownload>& currentDownloads = mPrivate ?
+    mDownloadManager->mCurrentPrivateDownloads :
+    mDownloadManager->mCurrentDownloads;
+  (void)currentDownloads.RemoveObject(this);
+
+  // Make sure we do not automatically resume
+  mAutoResume = DONT_RESUME;
+}
+
+nsresult
+nsDownload::ExecuteDesiredAction()
+{
+  // nsExternalHelperAppHandler is the only caller of AddDownload that sets a
+  // tempfile parameter. In this case, execute the desired action according to
+  // the saved mime info.
+  if (!mTempFile) {
+    return NS_OK;
+  }
+
+  // We need to bail if for some reason the temp file got removed
+  bool fileExists;
+  if (NS_FAILED(mTempFile->Exists(&fileExists)) || !fileExists)
+    return NS_ERROR_FILE_NOT_FOUND;
+
+  // Assume an unknown action is save to disk
+  nsHandlerInfoAction action = nsIMIMEInfo::saveToDisk;
+  if (mMIMEInfo) {
+    nsresult rv = mMIMEInfo->GetPreferredAction(&action);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsresult rv = NS_OK;
+  switch (action) {
+    case nsIMIMEInfo::saveToDisk:
+      // Move the file to the proper location
+      rv = MoveTempToTarget();
+      if (NS_SUCCEEDED(rv)) {
+        rv = FixTargetPermissions();
+      }
+      break;
+    case nsIMIMEInfo::useHelperApp:
+    case nsIMIMEInfo::useSystemDefault:
+      // For these cases we have to move the file to the target location and
+      // open with the appropriate application
+      rv = OpenWithApplication();
+      break;
+    default:
+      break;
+  }
+
+  return rv;
+}
+
+nsresult
+nsDownload::FixTargetPermissions()
+{
+  nsCOMPtr<nsIFile> target;
+  nsresult rv = GetTargetFile(getter_AddRefs(target));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Set perms according to umask.
+  nsCOMPtr<nsIPropertyBag2> infoService =
+      do_GetService("@mozilla.org/system-info;1");
+  uint32_t gUserUmask = 0;
+  rv = infoService->GetPropertyAsUint32(NS_LITERAL_STRING("umask"),
+                                        &gUserUmask);
+  if (NS_SUCCEEDED(rv)) {
+    (void)target->SetPermissions(0666 & ~gUserUmask);
+  }
+  return NS_OK;
+}
+
+nsresult
+nsDownload::MoveTempToTarget()
+{
+  nsCOMPtr<nsIFile> target;
+  nsresult rv = GetTargetFile(getter_AddRefs(target));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // MoveTo will fail if the file already exists, but we've already obtained
+  // confirmation from the user that this is OK, so remove it if it exists.
+  bool fileExists;
+  if (NS_SUCCEEDED(target->Exists(&fileExists)) && fileExists) {
+    rv = target->Remove(false);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Extract the new leaf name from the file location
+  nsAutoString fileName;
+  rv = target->GetLeafName(fileName);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIFile> dir;
+  rv = target->GetParent(getter_AddRefs(dir));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = mTempFile->MoveTo(dir, fileName);
+  return rv;
+}
+
+nsresult
+nsDownload::OpenWithApplication()
+{
+  // First move the temporary file to the target location
+  nsCOMPtr<nsIFile> target;
+  nsresult rv = GetTargetFile(getter_AddRefs(target));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Move the temporary file to the target location
+  rv = MoveTempToTarget();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool deleteTempFileOnExit;
+  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
+  if (!prefs || NS_FAILED(prefs->GetBoolPref(PREF_BH_DELETETEMPFILEONEXIT,
+                                             &deleteTempFileOnExit))) {
+    // No prefservice or no pref set; use default value
+#if !defined(XP_MACOSX)
+    // Mac users have been very verbal about temp files being deleted on
+    // app exit - they don't like it - but we'll continue to do this on
+    // other platforms for now.
+    deleteTempFileOnExit = true;
+#else
+    deleteTempFileOnExit = false;
+#endif
+  }
+
+  // Always schedule files to be deleted at the end of the private browsing
+  // mode, regardless of the value of the pref.
+  if (deleteTempFileOnExit || mPrivate) {
+
+    // Make the tmp file readonly so users won't lose changes.
+    target->SetPermissions(0400);
+
+    // Use the ExternalHelperAppService to push the temporary file to the list
+    // of files to be deleted on exit.
+    nsCOMPtr<nsPIExternalAppLauncher> appLauncher(do_GetService
+                    (NS_EXTERNALHELPERAPPSERVICE_CONTRACTID));
+
+    // Even if we are unable to get this service we return the result
+    // of LaunchWithFile() which makes more sense.
+    if (appLauncher) {
+      if (mPrivate) {
+        (void)appLauncher->DeleteTemporaryPrivateFileWhenPossible(target);
+      } else {
+        (void)appLauncher->DeleteTemporaryFileOnExit(target);
+      }
+    }
+  }
+
+  return mMIMEInfo->LaunchWithFile(target);
+}
+
+void
+nsDownload::SetStartTime(int64_t aStartTime)
+{
+  mStartTime = aStartTime;
+  mLastUpdate = aStartTime;
+}
+
+void
+nsDownload::SetProgressBytes(int64_t aCurrBytes, int64_t aMaxBytes)
+{
+  mCurrBytes = aCurrBytes;
+  mMaxBytes = aMaxBytes;
+
+  // Get the real bytes that include resume position
+  int64_t currBytes, maxBytes;
+  (void)GetAmountTransferred(&currBytes);
+  (void)GetSize(&maxBytes);
+
+  if (currBytes == maxBytes)
+    mPercentComplete = 100;
+  else if (maxBytes <= 0)
+    mPercentComplete = -1;
+  else
+    mPercentComplete = (int32_t)((double)currBytes / maxBytes * 100 + .5);
+}
+
+NS_IMETHODIMP
+nsDownload::Pause()
+{
+  if (!IsResumable())
+    return NS_ERROR_UNEXPECTED;
+
+  nsresult rv = CancelTransfer();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return SetState(nsIDownloadManager::DOWNLOAD_PAUSED);
+}
+
+nsresult
+nsDownload::CancelTransfer()
+{
+  nsresult rv = NS_OK;
+  if (mCancelable) {
+    rv = mCancelable->Cancel(NS_BINDING_ABORTED);
+    // we're done with this, so break the cycle
+    mCancelable = nullptr;
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsDownload::Cancel()
+{
+  // Don't cancel if download is already finished
+  if (IsFinished())
+    return NS_OK;
+
+  // Have the download cancel its connection
+  (void)CancelTransfer();
+
+  // Dump the temp file because we know we don't need the file anymore. The
+  // underlying transfer creating the file doesn't delete the file because it
+  // can't distinguish between a pause that cancels the transfer or a real
+  // cancel.
+  if (mTempFile) {
+    bool exists;
+    mTempFile->Exists(&exists);
+    if (exists)
+      mTempFile->Remove(false);
+  }
+
+  nsCOMPtr<nsIFile> file;
+  if (NS_SUCCEEDED(GetTargetFile(getter_AddRefs(file))))
+  {
+    bool exists;
+    file->Exists(&exists);
+    if (exists)
+      file->Remove(false);
+  }
+
+  nsresult rv = SetState(nsIDownloadManager::DOWNLOAD_CANCELED);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDownload::Resume()
+{
+  if (!IsPaused() || !IsResumable())
+    return NS_ERROR_UNEXPECTED;
+
+  nsresult rv;
+  nsCOMPtr<nsIWebBrowserPersist> wbp =
+    do_CreateInstance("@mozilla.org/embedding/browser/nsWebBrowserPersist;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = wbp->SetPersistFlags(nsIWebBrowserPersist::PERSIST_FLAGS_APPEND_TO_FILE |
+                            nsIWebBrowserPersist::PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Create a new channel for the source URI
+  nsCOMPtr<nsIChannel> channel;
+  nsCOMPtr<nsIInterfaceRequestor> ir(do_QueryInterface(wbp));
+  rv = NS_NewChannel(getter_AddRefs(channel),
+                     mSource,
+                     nsContentUtils::GetSystemPrincipal(),
+                     nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
+                     nsIContentPolicy::TYPE_OTHER,
+                     nullptr,  // aLoadGroup
+                     ir);
+
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIPrivateBrowsingChannel> pbChannel = do_QueryInterface(channel);
+  if (pbChannel) {
+    pbChannel->SetPrivate(mPrivate);
+  }
+
+  // Make sure we can get a file, either the temporary or the real target, for
+  // both purposes of file size and a target to write to
+  nsCOMPtr<nsIFile> targetLocalFile(mTempFile);
+  if (!targetLocalFile) {
+    rv = GetTargetFile(getter_AddRefs(targetLocalFile));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Get the file size to be used as an offset, but if anything goes wrong
+  // along the way, we'll silently restart at 0.
+  int64_t fileSize;
+  //  We need a nsIFile clone to deal with file size caching issues. :(
+  nsCOMPtr<nsIFile> clone;
+  if (NS_FAILED(targetLocalFile->Clone(getter_AddRefs(clone))) ||
+      NS_FAILED(clone->GetFileSize(&fileSize)))
+    fileSize = 0;
+
+  // Set the channel to resume at the right position along with the entityID
+  nsCOMPtr<nsIResumableChannel> resumableChannel(do_QueryInterface(channel));
+  if (!resumableChannel)
+    return NS_ERROR_UNEXPECTED;
+  rv = resumableChannel->ResumeAt(fileSize, mEntityID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // If we know the max size, we know what it should be when resuming
+  int64_t maxBytes;
+  GetSize(&maxBytes);
+  SetProgressBytes(0, maxBytes != -1 ? maxBytes - fileSize : -1);
+  // Track where we resumed because progress notifications restart at 0
+  mResumedAt = fileSize;
+
+  // Set the referrer
+  if (mReferrer) {
+    nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
+    if (httpChannel) {
+      rv = httpChannel->SetReferrer(mReferrer);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  }
+
+  // Creates a cycle that will be broken when the download finishes
+  mCancelable = wbp;
+  (void)wbp->SetProgressListener(this);
+
+  // Save the channel using nsIWBP
+  rv = wbp->SaveChannel(channel, targetLocalFile);
+  if (NS_FAILED(rv)) {
+    mCancelable = nullptr;
+    (void)wbp->SetProgressListener(nullptr);
+    return rv;
+  }
+
+  return SetState(nsIDownloadManager::DOWNLOAD_DOWNLOADING);
+}
+
+NS_IMETHODIMP
+nsDownload::Remove()
+{
+  return mDownloadManager->RemoveDownload(mGUID);
+}
+
+NS_IMETHODIMP
+nsDownload::Retry()
+{
+  return mDownloadManager->RetryDownload(mGUID);
+}
+
+bool
+nsDownload::IsPaused()
+{
+  return mDownloadState == nsIDownloadManager::DOWNLOAD_PAUSED;
+}
+
+bool
+nsDownload::IsResumable()
+{
+  return !mEntityID.IsEmpty();
+}
+
+bool
+nsDownload::WasResumed()
+{
+  return mResumedAt != -1;
+}
+
+bool
+nsDownload::ShouldAutoResume()
+{
+  return mAutoResume == AUTO_RESUME;
+}
+
+bool
+nsDownload::IsFinishable()
+{
+  return mDownloadState == nsIDownloadManager::DOWNLOAD_NOTSTARTED ||
+         mDownloadState == nsIDownloadManager::DOWNLOAD_QUEUED ||
+         mDownloadState == nsIDownloadManager::DOWNLOAD_DOWNLOADING;
+}
+
+bool
+nsDownload::IsFinished()
+{
+  return mDownloadState == nsIDownloadManager::DOWNLOAD_FINISHED;
+}
+
+nsresult
+nsDownload::UpdateDB()
+{
+  NS_ASSERTION(mID, "Download ID is stored as zero.  This is bad!");
+  NS_ASSERTION(mDownloadManager, "Egads!  We have no download manager!");
+
+  mozIStorageStatement *stmt = mPrivate ?
+    mDownloadManager->mUpdatePrivateDownloadStatement : mDownloadManager->mUpdateDownloadStatement;
+
+  nsAutoString tempPath;
+  if (mTempFile)
+    (void)mTempFile->GetPath(tempPath);
+  nsresult rv = stmt->BindStringByName(NS_LITERAL_CSTRING("tempPath"), tempPath);
+
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("startTime"), mStartTime);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("endTime"), mLastUpdate);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("state"), mDownloadState);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (mReferrer) {
+    nsAutoCString referrer;
+    rv = mReferrer->GetSpec(referrer);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("referrer"), referrer);
+  } else {
+    rv = stmt->BindNullByName(NS_LITERAL_CSTRING("referrer"));
+  }
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("entityID"), mEntityID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  int64_t currBytes;
+  (void)GetAmountTransferred(&currBytes);
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("currBytes"), currBytes);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  int64_t maxBytes;
+  (void)GetSize(&maxBytes);
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("maxBytes"), maxBytes);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt32ByName(NS_LITERAL_CSTRING("autoResume"), mAutoResume);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("id"), mID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return stmt->Execute();
+}
+
+nsresult
+nsDownload::FailDownload(nsresult aStatus, const char16_t *aMessage)
+{
+  // Grab the bundle before potentially losing our member variables
+  nsCOMPtr<nsIStringBundle> bundle = mDownloadManager->mBundle;
+
+  (void)SetState(nsIDownloadManager::DOWNLOAD_FAILED);
+
+  // Get title for alert.
+  nsXPIDLString title;
+  nsresult rv = bundle->GetStringFromName(
+    u"downloadErrorAlertTitle", getter_Copies(title));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Get a generic message if we weren't supplied one
+  nsXPIDLString message;
+  message = aMessage;
+  if (message.IsEmpty()) {
+    rv = bundle->GetStringFromName(
+      u"downloadErrorGeneric", getter_Copies(message));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Get Download Manager window to be parent of alert
+  nsCOMPtr<nsIWindowMediator> wm =
+    do_GetService(NS_WINDOWMEDIATOR_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<mozIDOMWindowProxy> dmWindow;
+  rv = wm->GetMostRecentWindow(u"Download:Manager",
+                               getter_AddRefs(dmWindow));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Show alert
+  nsCOMPtr<nsIPromptService> prompter =
+    do_GetService("@mozilla.org/embedcomp/prompt-service;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return prompter->Alert(dmWindow, title, message);
+}