Add m-esr52 at 52.6.0

1 files changed, 4239 insertions, 0 deletions

diff --git a/dom/plugins/base/nsPluginHost.cpp b/dom/plugins/base/nsPluginHost.cpp
new file mode 100644
index 000000000..6ee23f38b
--- /dev/null
+++ b/dom/plugins/base/nsPluginHost.cpp
@@ -0,0 +1,4239 @@
+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+/* nsPluginHost.cpp - top-level plugin management code */
+
+#include "nscore.h"
+#include "nsPluginHost.h"
+
+#include <cstdlib>
+#include <stdio.h>
+#include "prio.h"
+#include "prmem.h"
+#include "nsNPAPIPlugin.h"
+#include "nsNPAPIPluginStreamListener.h"
+#include "nsNPAPIPluginInstance.h"
+#include "nsPluginInstanceOwner.h"
+#include "nsObjectLoadingContent.h"
+#include "nsIHTTPHeaderListener.h"
+#include "nsIHttpHeaderVisitor.h"
+#include "nsIObserverService.h"
+#include "nsIHttpProtocolHandler.h"
+#include "nsIHttpChannel.h"
+#include "nsIUploadChannel.h"
+#include "nsIByteRangeRequest.h"
+#include "nsIStreamListener.h"
+#include "nsIInputStream.h"
+#include "nsIOutputStream.h"
+#include "nsIURL.h"
+#include "nsTArray.h"
+#include "nsReadableUtils.h"
+#include "nsProtocolProxyService.h"
+#include "nsIStreamConverterService.h"
+#include "nsIFile.h"
+#if defined(XP_MACOSX)
+#include "nsILocalFileMac.h"
+#endif
+#include "nsISeekableStream.h"
+#include "nsNetUtil.h"
+#include "nsIFileStreams.h"
+#include "nsISimpleEnumerator.h"
+#include "nsIStringStream.h"
+#include "nsIProgressEventSink.h"
+#include "nsIDocument.h"
+#include "nsPluginLogging.h"
+#include "nsIScriptChannel.h"
+#include "nsIBlocklistService.h"
+#include "nsVersionComparator.h"
+#include "nsIObjectLoadingContent.h"
+#include "nsIWritablePropertyBag2.h"
+#include "nsICategoryManager.h"
+#include "nsPluginStreamListenerPeer.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/FakePluginTagInitBinding.h"
+#include "mozilla/LoadInfo.h"
+#include "mozilla/plugins/PluginAsyncSurrogate.h"
+#include "mozilla/plugins/PluginBridge.h"
+#include "mozilla/plugins/PluginTypes.h"
+#include "mozilla/Preferences.h"
+
+#include "nsEnumeratorUtils.h"
+#include "nsXPCOM.h"
+#include "nsXPCOMCID.h"
+#include "nsISupportsPrimitives.h"
+
+#include "nsXULAppAPI.h"
+#include "nsIXULRuntime.h"
+
+// for the dialog
+#include "nsIWindowWatcher.h"
+#include "nsIDOMElement.h"
+#include "nsIDOMWindow.h"
+
+#include "nsNetCID.h"
+#include "mozilla/Sprintf.h"
+#include "nsThreadUtils.h"
+#include "nsIInputStreamTee.h"
+#include "nsQueryObject.h"
+
+#include "nsDirectoryServiceDefs.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsPluginDirServiceProvider.h"
+
+#include "nsUnicharUtils.h"
+#include "nsPluginManifestLineReader.h"
+
+#include "nsIWeakReferenceUtils.h"
+#include "nsIPresShell.h"
+#include "nsPluginNativeWindow.h"
+#include "nsIContentPolicy.h"
+#include "nsContentPolicyUtils.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Telemetry.h"
+#include "nsIImageLoadingContent.h"
+#include "mozilla/Preferences.h"
+#include "nsVersionComparator.h"
+#include "nsNullPrincipal.h"
+
+#if defined(XP_WIN)
+#include "nsIWindowMediator.h"
+#include "nsIBaseWindow.h"
+#include "windows.h"
+#include "winbase.h"
+#endif
+
+#ifdef ANDROID
+#include <android/log.h>
+#define LOG(args...)  __android_log_print(ANDROID_LOG_INFO, "GeckoPlugins" , ## args)
+#endif
+
+#if MOZ_CRASHREPORTER
+#include "nsExceptionHandler.h"
+#endif
+
+#include "npapi.h"
+
+using namespace mozilla;
+using mozilla::TimeStamp;
+using mozilla::plugins::PluginTag;
+using mozilla::plugins::PluginAsyncSurrogate;
+using mozilla::dom::FakePluginTagInit;
+
+// Null out a strong ref to a linked list iteratively to avoid
+// exhausting the stack (bug 486349).
+#define NS_ITERATIVE_UNREF_LIST(type_, list_, mNext_)                \
+  {                                                                  \
+    while (list_) {                                                  \
+      type_ temp = list_->mNext_;                                    \
+      list_->mNext_ = nullptr;                                       \
+      list_ = temp;                                                  \
+    }                                                                \
+  }
+
+// this is the name of the directory which will be created
+// to cache temporary files.
+#define kPluginTmpDirName NS_LITERAL_CSTRING("plugtmp")
+
+static const char *kPrefWhitelist = "plugin.allowed_types";
+static const char *kPrefLoadInParentPrefix = "plugin.load_in_parent_process.";
+static const char *kPrefDisableFullPage = "plugin.disable_full_page_plugin_for_types";
+static const char *kPrefJavaMIME = "plugin.java.mime";
+
+// How long we wait before unloading an idle plugin process.
+// Defaults to 30 seconds.
+static const char *kPrefUnloadPluginTimeoutSecs = "dom.ipc.plugins.unloadTimeoutSecs";
+static const uint32_t kDefaultPluginUnloadingTimeout = 30;
+
+static const char *kPluginRegistryVersion = "0.18";
+
+static const char kDirectoryServiceContractID[] = "@mozilla.org/file/directory_service;1";
+
+#define kPluginRegistryFilename NS_LITERAL_CSTRING("pluginreg.dat")
+
+#ifdef PLUGIN_LOGGING
+LazyLogModule nsPluginLogging::gNPNLog(NPN_LOG_NAME);
+LazyLogModule nsPluginLogging::gNPPLog(NPP_LOG_NAME);
+LazyLogModule nsPluginLogging::gPluginLog(PLUGIN_LOG_NAME);
+#endif
+
+// #defines for plugin cache and prefs
+#define NS_PREF_MAX_NUM_CACHED_INSTANCES "browser.plugins.max_num_cached_plugins"
+// Raise this from '10' to '50' to work around a bug in Apple's current Java
+// plugins on OS X Lion and SnowLeopard.  See bug 705931.
+#define DEFAULT_NUMBER_OF_STOPPED_INSTANCES 50
+
+nsIFile *nsPluginHost::sPluginTempDir;
+nsPluginHost *nsPluginHost::sInst;
+
+/* to cope with short read */
+/* we should probably put this into a global library now that this is the second
+   time we need this. */
+static
+int32_t
+busy_beaver_PR_Read(PRFileDesc *fd, void * start, int32_t len)
+{
+    int n;
+    int32_t remaining = len;
+
+    while (remaining > 0)
+    {
+        n = PR_Read(fd, start, remaining);
+        if (n < 0)
+        {
+            /* may want to repeat if errno == EINTR */
+            if( (len - remaining) == 0 ) // no octet is ever read
+                return -1;
+            break;
+        }
+        else
+        {
+            remaining -= n;
+            char *cp = (char *) start;
+            cp += n;
+            start = cp;
+        }
+    }
+    return len - remaining;
+}
+
+NS_IMPL_ISUPPORTS0(nsInvalidPluginTag)
+
+nsInvalidPluginTag::nsInvalidPluginTag(const char* aFullPath, int64_t aLastModifiedTime)
+: mFullPath(aFullPath),
+  mLastModifiedTime(aLastModifiedTime),
+  mSeen(false)
+{}
+
+nsInvalidPluginTag::~nsInvalidPluginTag()
+{}
+
+// Helper to check for a MIME in a comma-delimited preference
+static bool
+IsTypeInList(const nsCString& aMimeType, nsCString aTypeList)
+{
+  nsAutoCString searchStr;
+  searchStr.Assign(',');
+  searchStr.Append(aTypeList);
+  searchStr.Append(',');
+
+  nsACString::const_iterator start, end;
+
+  searchStr.BeginReading(start);
+  searchStr.EndReading(end);
+
+  nsAutoCString commaSeparated;
+  commaSeparated.Assign(',');
+  commaSeparated += aMimeType;
+  commaSeparated.Append(',');
+
+  // Lower-case the search string and MIME type to properly handle a mixed-case
+  // type, as MIME types are case insensitive.
+  ToLowerCase(searchStr);
+  ToLowerCase(commaSeparated);
+
+  return FindInReadable(commaSeparated, start, end);
+}
+
+// flat file reg funcs
+static
+bool ReadSectionHeader(nsPluginManifestLineReader& reader, const char *token)
+{
+  do {
+    if (*reader.LinePtr() == '[') {
+      char* p = reader.LinePtr() + (reader.LineLength() - 1);
+      if (*p != ']')
+        break;
+      *p = 0;
+
+      char* values[1];
+      if (1 != reader.ParseLine(values, 1))
+        break;
+      // ignore the leading '['
+      if (PL_strcmp(values[0]+1, token)) {
+        break; // it's wrong token
+      }
+      return true;
+    }
+  } while (reader.NextLine());
+  return false;
+}
+
+static bool UnloadPluginsASAP()
+{
+  return (Preferences::GetUint(kPrefUnloadPluginTimeoutSecs, kDefaultPluginUnloadingTimeout) == 0);
+}
+
+nsPluginHost::nsPluginHost()
+  // No need to initialize members to nullptr, false etc because this class
+  // has a zeroing operator new.
+{
+  // Bump the pluginchanged epoch on startup. This insures content gets a
+  // good plugin list the first time it requests it. Normally we'd just
+  // init this to 1, but due to the unique nature of our ctor we need to do
+  // this manually.
+  if (XRE_IsParentProcess()) {
+    IncrementChromeEpoch();
+  } else {
+    // When NPAPI requests the proxy setting by calling |FindProxyForURL|,
+    // the service is requested and initialized asynchronously, but
+    // |FindProxyForURL| is synchronous, so we should initialize this earlier.
+    nsCOMPtr<nsIProtocolProxyService> proxyService =
+      do_GetService(NS_PROTOCOLPROXYSERVICE_CONTRACTID);
+  }
+
+  // check to see if pref is set at startup to let plugins take over in
+  // full page mode for certain image mime types that we handle internally
+  mOverrideInternalTypes =
+    Preferences::GetBool("plugin.override_internal_types", false);
+
+  mPluginsDisabled = Preferences::GetBool("plugin.disable", false);
+
+  Preferences::AddStrongObserver(this, "plugin.disable");
+
+  nsCOMPtr<nsIObserverService> obsService =
+    mozilla::services::GetObserverService();
+  if (obsService) {
+    obsService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
+    obsService->AddObserver(this, "blocklist-updated", false);
+#ifdef MOZ_WIDGET_ANDROID
+    obsService->AddObserver(this, "application-foreground", false);
+    obsService->AddObserver(this, "application-background", false);
+#endif
+  }
+
+#ifdef PLUGIN_LOGGING
+  MOZ_LOG(nsPluginLogging::gNPNLog, PLUGIN_LOG_ALWAYS,("NPN Logging Active!\n"));
+  MOZ_LOG(nsPluginLogging::gPluginLog, PLUGIN_LOG_ALWAYS,("General Plugin Logging Active! (nsPluginHost::ctor)\n"));
+  MOZ_LOG(nsPluginLogging::gNPPLog, PLUGIN_LOG_ALWAYS,("NPP Logging Active!\n"));
+
+  PLUGIN_LOG(PLUGIN_LOG_ALWAYS,("nsPluginHost::ctor\n"));
+  PR_LogFlush();
+#endif
+}
+
+nsPluginHost::~nsPluginHost()
+{
+  PLUGIN_LOG(PLUGIN_LOG_ALWAYS,("nsPluginHost::dtor\n"));
+
+  UnloadPlugins();
+  sInst = nullptr;
+}
+
+NS_IMPL_ISUPPORTS(nsPluginHost,
+                  nsIPluginHost,
+                  nsIObserver,
+                  nsITimerCallback,
+                  nsISupportsWeakReference)
+
+already_AddRefed<nsPluginHost>
+nsPluginHost::GetInst()
+{
+  if (!sInst) {
+    sInst = new nsPluginHost();
+    if (!sInst)
+      return nullptr;
+    NS_ADDREF(sInst);
+  }
+
+  RefPtr<nsPluginHost> inst = sInst;
+  return inst.forget();
+}
+
+bool nsPluginHost::IsRunningPlugin(nsPluginTag * aPluginTag)
+{
+  if (!aPluginTag || !aPluginTag->mPlugin) {
+    return false;
+  }
+
+  if (aPluginTag->mContentProcessRunningCount) {
+    return true;
+  }
+
+  for (uint32_t i = 0; i < mInstances.Length(); i++) {
+    nsNPAPIPluginInstance *instance = mInstances[i].get();
+    if (instance &&
+        instance->GetPlugin() == aPluginTag->mPlugin &&
+        instance->IsRunning()) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+nsresult nsPluginHost::ReloadPlugins()
+{
+  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
+  ("nsPluginHost::ReloadPlugins Begin\n"));
+
+  nsresult rv = NS_OK;
+
+  // this will create the initial plugin list out of cache
+  // if it was not created yet
+  if (!mPluginsLoaded)
+    return LoadPlugins();
+
+  // we are re-scanning plugins. New plugins may have been added, also some
+  // plugins may have been removed, so we should probably shut everything down
+  // but don't touch running (active and not stopped) plugins
+
+  // check if plugins changed, no need to do anything else
+  // if no changes to plugins have been made
+  // false instructs not to touch the plugin list, just to
+  // look for possible changes
+  bool pluginschanged = true;
+  FindPlugins(false, &pluginschanged);
+
+  // if no changed detected, return an appropriate error code
+  if (!pluginschanged)
+    return NS_ERROR_PLUGINS_PLUGINSNOTCHANGED;
+
+  // shutdown plugins and kill the list if there are no running plugins
+  RefPtr<nsPluginTag> prev;
+  RefPtr<nsPluginTag> next;
+
+  for (RefPtr<nsPluginTag> p = mPlugins; p != nullptr;) {
+    next = p->mNext;
+
+    // only remove our plugin from the list if it's not running.
+    if (!IsRunningPlugin(p)) {
+      if (p == mPlugins)
+        mPlugins = next;
+      else
+        prev->mNext = next;
+
+      p->mNext = nullptr;
+
+      // attempt to unload plugins whenever they are removed from the list
+      p->TryUnloadPlugin(false);
+
+      p = next;
+      continue;
+    }
+
+    prev = p;
+    p = next;
+  }
+
+  // set flags
+  mPluginsLoaded = false;
+
+  // load them again
+  rv = LoadPlugins();
+
+  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
+  ("nsPluginHost::ReloadPlugins End\n"));
+
+  return rv;
+}
+
+#define NS_RETURN_UASTRING_SIZE 128
+
+nsresult nsPluginHost::UserAgent(const char **retstring)
+{
+  static char resultString[NS_RETURN_UASTRING_SIZE];
+  nsresult res;
+
+  nsCOMPtr<nsIHttpProtocolHandler> http = do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http", &res);
+  if (NS_FAILED(res))
+    return res;
+
+  nsAutoCString uaString;
+  res = http->GetUserAgent(uaString);
+
+  if (NS_SUCCEEDED(res)) {
+    if (NS_RETURN_UASTRING_SIZE > uaString.Length()) {
+      PL_strcpy(resultString, uaString.get());
+    } else {
+      // Copy as much of UA string as we can (terminate at right-most space).
+      PL_strncpy(resultString, uaString.get(), NS_RETURN_UASTRING_SIZE);
+      for (int i = NS_RETURN_UASTRING_SIZE - 1; i >= 0; i--) {
+        if (i == 0) {
+          resultString[NS_RETURN_UASTRING_SIZE - 1] = '\0';
+        }
+        else if (resultString[i] == ' ') {
+          resultString[i] = '\0';
+          break;
+        }
+      }
+    }
+    *retstring = resultString;
+  }
+  else {
+    *retstring = nullptr;
+  }
+
+  PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("nsPluginHost::UserAgent return=%s\n", *retstring));
+
+  return res;
+}
+
+nsresult nsPluginHost::GetURL(nsISupports* pluginInst,
+                              const char* url,
+                              const char* target,
+                              nsNPAPIPluginStreamListener* streamListener,
+                              const char* altHost,
+                              const char* referrer,
+                              bool forceJSEnabled)
+{
+  return GetURLWithHeaders(static_cast<nsNPAPIPluginInstance*>(pluginInst),
+                           url, target, streamListener, altHost, referrer,
+                           forceJSEnabled, 0, nullptr);
+}
+
+nsresult nsPluginHost::GetURLWithHeaders(nsNPAPIPluginInstance* pluginInst,
+                                         const char* url,
+                                         const char* target,
+                                         nsNPAPIPluginStreamListener* streamListener,
+                                         const char* altHost,
+                                         const char* referrer,
+                                         bool forceJSEnabled,
+                                         uint32_t getHeadersLength,
+                                         const char* getHeaders)
+{
+  // we can only send a stream back to the plugin (as specified by a
+  // null target) if we also have a nsNPAPIPluginStreamListener to talk to
+  if (!target && !streamListener) {
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+
+  nsresult rv = NS_OK;
+
+  if (target) {
+    RefPtr<nsPluginInstanceOwner> owner = pluginInst->GetOwner();
+    if (owner) {
+      rv = owner->GetURL(url, target, nullptr, nullptr, 0, true);
+    }
+  }
+
+  if (streamListener) {
+    rv = NewPluginURLStream(NS_ConvertUTF8toUTF16(url), pluginInst,
+                            streamListener, nullptr,
+                            getHeaders, getHeadersLength);
+  }
+  return rv;
+}
+
+nsresult nsPluginHost::PostURL(nsISupports* pluginInst,
+                               const char* url,
+                               uint32_t postDataLen,
+                               const char* postData,
+                               bool isFile,
+                               const char* target,
+                               nsNPAPIPluginStreamListener* streamListener,
+                               const char* altHost,
+                               const char* referrer,
+                               bool forceJSEnabled,
+                               uint32_t postHeadersLength,
+                               const char* postHeaders)
+{
+  nsresult rv;
+
+  // we can only send a stream back to the plugin (as specified
+  // by a null target) if we also have a nsNPAPIPluginStreamListener
+  // to talk to also
+  if (!target && !streamListener)
+    return NS_ERROR_ILLEGAL_VALUE;
+
+  nsNPAPIPluginInstance* instance = static_cast<nsNPAPIPluginInstance*>(pluginInst);
+
+  nsCOMPtr<nsIInputStream> postStream;
+  if (isFile) {
+    nsCOMPtr<nsIFile> file;
+    rv = CreateTempFileToPost(postData, getter_AddRefs(file));
+    if (NS_FAILED(rv))
+      return rv;
+
+    nsCOMPtr<nsIInputStream> fileStream;
+    rv = NS_NewLocalFileInputStream(getter_AddRefs(fileStream),
+                                    file,
+                                    PR_RDONLY,
+                                    0600,
+                                    nsIFileInputStream::DELETE_ON_CLOSE |
+                                    nsIFileInputStream::CLOSE_ON_EOF);
+    if (NS_FAILED(rv))
+      return rv;
+
+    rv = NS_NewBufferedInputStream(getter_AddRefs(postStream), fileStream, 8192);
+    if (NS_FAILED(rv))
+      return rv;
+  } else {
+    char *dataToPost;
+    uint32_t newDataToPostLen;
+    ParsePostBufferToFixHeaders(postData, postDataLen, &dataToPost, &newDataToPostLen);
+    if (!dataToPost)
+      return NS_ERROR_UNEXPECTED;
+
+    nsCOMPtr<nsIStringInputStream> sis = do_CreateInstance("@mozilla.org/io/string-input-stream;1", &rv);
+    if (!sis) {
+      free(dataToPost);
+      return rv;
+    }
+
+    // data allocated by ParsePostBufferToFixHeaders() is managed and
+    // freed by the string stream.
+    postDataLen = newDataToPostLen;
+    sis->AdoptData(dataToPost, postDataLen);
+    postStream = sis;
+  }
+
+  if (target) {
+    RefPtr<nsPluginInstanceOwner> owner = instance->GetOwner();
+    if (owner) {
+      rv = owner->GetURL(url, target, postStream,
+                         (void*)postHeaders, postHeadersLength, true);
+    }
+  }
+
+  // if we don't have a target, just create a stream.
+  if (streamListener) {
+    rv = NewPluginURLStream(NS_ConvertUTF8toUTF16(url), instance,
+                            streamListener,
+                            postStream, postHeaders, postHeadersLength);
+  }
+  return rv;
+}
+
+/* This method queries the prefs for proxy information.
+ * It has been tested and is known to work in the following three cases
+ * when no proxy host or port is specified
+ * when only the proxy host is specified
+ * when only the proxy port is specified
+ * This method conforms to the return code specified in
+ * http://developer.netscape.com/docs/manuals/proxy/adminnt/autoconf.htm#1020923
+ * with the exception that multiple values are not implemented.
+ */
+
+nsresult nsPluginHost::FindProxyForURL(const char* url, char* *result)
+{
+  if (!url || !result) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  nsresult res;
+
+  nsCOMPtr<nsIProtocolProxyService> proxyService =
+    do_GetService(NS_PROTOCOLPROXYSERVICE_CONTRACTID, &res);
+  if (NS_FAILED(res) || !proxyService)
+    return res;
+
+  RefPtr<nsProtocolProxyService> rawProxyService = do_QueryObject(proxyService);
+  if (!rawProxyService) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // make a temporary channel from the argument url
+  nsCOMPtr<nsIURI> uri;
+  res = NS_NewURI(getter_AddRefs(uri), nsDependentCString(url));
+  NS_ENSURE_SUCCESS(res, res);
+
+  nsCOMPtr<nsIPrincipal> nullPrincipal = nsNullPrincipal::Create();
+  // The following channel is never openend, so it does not matter what
+  // securityFlags we pass; let's follow the principle of least privilege.
+  nsCOMPtr<nsIChannel> tempChannel;
+  res = NS_NewChannel(getter_AddRefs(tempChannel), uri, nullPrincipal,
+                      nsILoadInfo::SEC_REQUIRE_SAME_ORIGIN_DATA_IS_BLOCKED,
+                      nsIContentPolicy::TYPE_OTHER);
+  NS_ENSURE_SUCCESS(res, res);
+
+  nsCOMPtr<nsIProxyInfo> pi;
+
+  // Remove this deprecated call in the future (see Bug 778201):
+  res = rawProxyService->DeprecatedBlockingResolve(tempChannel, 0, getter_AddRefs(pi));
+  if (NS_FAILED(res))
+    return res;
+
+  nsAutoCString host, type;
+  int32_t port = -1;
+
+  // These won't fail, and even if they do... we'll be ok.
+  if (pi) {
+    pi->GetType(type);
+    pi->GetHost(host);
+    pi->GetPort(&port);
+  }
+
+  if (!pi || host.IsEmpty() || port <= 0 || host.EqualsLiteral("direct")) {
+    *result = PL_strdup("DIRECT");
+  } else if (type.EqualsLiteral("http")) {
+    *result = PR_smprintf("PROXY %s:%d", host.get(), port);
+  } else if (type.EqualsLiteral("socks4")) {
+    *result = PR_smprintf("SOCKS %s:%d", host.get(), port);
+  } else if (type.EqualsLiteral("socks")) {
+    // XXX - this is socks5, but there is no API for us to tell the
+    // plugin that fact. SOCKS for now, in case the proxy server
+    // speaks SOCKS4 as well. See bug 78176
+    // For a long time this was returning an http proxy type, so
+    // very little is probably broken by this
+    *result = PR_smprintf("SOCKS %s:%d", host.get(), port);
+  } else {
+    NS_ASSERTION(false, "Unknown proxy type!");
+    *result = PL_strdup("DIRECT");
+  }
+
+  if (nullptr == *result)
+    res = NS_ERROR_OUT_OF_MEMORY;
+
+  return res;
+}
+
+nsresult nsPluginHost::UnloadPlugins()
+{
+  PLUGIN_LOG(PLUGIN_LOG_NORMAL, ("nsPluginHost::UnloadPlugins Called\n"));
+
+  if (!mPluginsLoaded)
+    return NS_OK;
+
+  // we should call nsIPluginInstance::Stop and nsIPluginInstance::SetWindow
+  // for those plugins who want it
+  DestroyRunningInstances(nullptr);
+
+  nsPluginTag *pluginTag;
+  for (pluginTag = mPlugins; pluginTag; pluginTag = pluginTag->mNext) {
+    pluginTag->TryUnloadPlugin(true);
+  }
+
+  NS_ITERATIVE_UNREF_LIST(RefPtr<nsPluginTag>, mPlugins, mNext);
+  NS_ITERATIVE_UNREF_LIST(RefPtr<nsPluginTag>, mCachedPlugins, mNext);
+  NS_ITERATIVE_UNREF_LIST(RefPtr<nsInvalidPluginTag>, mInvalidPlugins, mNext);
+
+  // Lets remove any of the temporary files that we created.
+  if (sPluginTempDir) {
+    sPluginTempDir->Remove(true);
+    NS_RELEASE(sPluginTempDir);
+  }
+
+#ifdef XP_WIN
+  if (mPrivateDirServiceProvider) {
+    nsCOMPtr<nsIDirectoryService> dirService =
+      do_GetService(kDirectoryServiceContractID);
+    if (dirService)
+      dirService->UnregisterProvider(mPrivateDirServiceProvider);
+    mPrivateDirServiceProvider = nullptr;
+  }
+#endif /* XP_WIN */
+
+  mPluginsLoaded = false;
+
+  return NS_OK;
+}
+
+void nsPluginHost::OnPluginInstanceDestroyed(nsPluginTag* aPluginTag)
+{
+  bool hasInstance = false;
+  for (uint32_t i = 0; i < mInstances.Length(); i++) {
+    if (TagForPlugin(mInstances[i]->GetPlugin()) == aPluginTag) {
+      hasInstance = true;
+      break;
+    }
+  }
+
+  // We have some options for unloading plugins if they have no instances.
+  //
+  // Unloading plugins immediately can be bad - some plugins retain state
+  // between instances even when there are none. This is largely limited to
+  // going from one page to another, so state is retained without an instance
+  // for only a very short period of time. In order to allow this to work
+  // we don't unload plugins immediately by default. This is supported
+  // via a hidden user pref though.
+  //
+  // Another reason not to unload immediately is that loading is expensive,
+  // and it is better to leave popular plugins loaded.
+  //
+  // Our default behavior is to try to unload a plugin after a pref-controlled
+  // delay once its last instance is destroyed. This seems like a reasonable
+  // compromise that allows us to reclaim memory while allowing short state
+  // retention and avoid perf hits for loading popular plugins.
+  if (!hasInstance) {
+    if (UnloadPluginsASAP()) {
+      aPluginTag->TryUnloadPlugin(false);
+    } else {
+      if (aPluginTag->mUnloadTimer) {
+        aPluginTag->mUnloadTimer->Cancel();
+      } else {
+        aPluginTag->mUnloadTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
+      }
+      uint32_t unloadTimeout = Preferences::GetUint(kPrefUnloadPluginTimeoutSecs,
+                                                    kDefaultPluginUnloadingTimeout);
+      aPluginTag->mUnloadTimer->InitWithCallback(this,
+                                                 1000 * unloadTimeout,
+                                                 nsITimer::TYPE_ONE_SHOT);
+    }
+  }
+}
+
+nsresult
+nsPluginHost::GetPluginTempDir(nsIFile **aDir)
+{
+  if (!sPluginTempDir) {
+    nsCOMPtr<nsIFile> tmpDir;
+    nsresult rv = NS_GetSpecialDirectory(NS_OS_TEMP_DIR,
+                                         getter_AddRefs(tmpDir));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = tmpDir->AppendNative(kPluginTmpDirName);
+
+    // make it unique, and mode == 0700, not world-readable
+    rv = tmpDir->CreateUnique(nsIFile::DIRECTORY_TYPE, 0700);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    tmpDir.swap(sPluginTempDir);
+  }
+
+  return sPluginTempDir->Clone(aDir);
+}
+
+nsresult
+nsPluginHost::InstantiatePluginInstance(const nsACString& aMimeType, nsIURI* aURL,
+                                        nsObjectLoadingContent *aContent,
+                                        nsPluginInstanceOwner** aOwner)
+{
+  NS_ENSURE_ARG_POINTER(aOwner);
+
+#ifdef PLUGIN_LOGGING
+  nsAutoCString urlSpec;
+  if (aURL)
+    aURL->GetAsciiSpec(urlSpec);
+
+  MOZ_LOG(nsPluginLogging::gPluginLog, PLUGIN_LOG_NORMAL,
+        ("nsPluginHost::InstantiatePlugin Begin mime=%s, url=%s\n",
+         PromiseFlatCString(aMimeType).get(), urlSpec.get()));
+
+  PR_LogFlush();
+#endif
+
+  if (aMimeType.IsEmpty()) {
+    NS_NOTREACHED("Attempting to spawn a plugin with no mime type");
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<nsPluginInstanceOwner> instanceOwner = new nsPluginInstanceOwner();
+  if (!instanceOwner) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  nsCOMPtr<nsIContent> ourContent = do_QueryInterface(static_cast<nsIImageLoadingContent*>(aContent));
+  nsresult rv = instanceOwner->Init(ourContent);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsPluginTagType tagType;
+  rv = instanceOwner->GetTagType(&tagType);
+  if (NS_FAILED(rv)) {
+    instanceOwner->Destroy();
+    return rv;
+  }
+
+  if (tagType != nsPluginTagType_Embed &&
+      tagType != nsPluginTagType_Applet &&
+      tagType != nsPluginTagType_Object) {
+    instanceOwner->Destroy();
+    return NS_ERROR_FAILURE;
+  }
+
+  rv = SetUpPluginInstance(aMimeType, aURL, instanceOwner);
+  if (NS_FAILED(rv)) {
+    instanceOwner->Destroy();
+    return NS_ERROR_FAILURE;
+  }
+  const bool isAsyncInit = (rv == NS_PLUGIN_INIT_PENDING);
+
+  RefPtr<nsNPAPIPluginInstance> instance;
+  rv = instanceOwner->GetInstance(getter_AddRefs(instance));
+  if (NS_FAILED(rv)) {
+    instanceOwner->Destroy();
+    return rv;
+  }
+
+  // Async init plugins will initiate their own widget creation.
+  if (!isAsyncInit && instance) {
+    CreateWidget(instanceOwner);
+  }
+
+  // At this point we consider instantiation to be successful. Do not return an error.
+  instanceOwner.forget(aOwner);
+
+#ifdef PLUGIN_LOGGING
+  nsAutoCString urlSpec2;
+  if (aURL != nullptr) aURL->GetAsciiSpec(urlSpec2);
+
+  MOZ_LOG(nsPluginLogging::gPluginLog, PLUGIN_LOG_NORMAL,
+        ("nsPluginHost::InstantiatePlugin Finished mime=%s, rv=%d, url=%s\n",
+         PromiseFlatCString(aMimeType).get(), rv, urlSpec2.get()));
+
+  PR_LogFlush();
+#endif
+
+  return NS_OK;
+}
+
+nsPluginTag*
+nsPluginHost::FindTagForLibrary(PRLibrary* aLibrary)
+{
+  nsPluginTag* pluginTag;
+  for (pluginTag = mPlugins; pluginTag; pluginTag = pluginTag->mNext) {
+    if (pluginTag->mLibrary == aLibrary) {
+      return pluginTag;
+    }
+  }
+  return nullptr;
+}
+
+nsPluginTag*
+nsPluginHost::TagForPlugin(nsNPAPIPlugin* aPlugin)
+{
+  nsPluginTag* pluginTag;
+  for (pluginTag = mPlugins; pluginTag; pluginTag = pluginTag->mNext) {
+    if (pluginTag->mPlugin == aPlugin) {
+      return pluginTag;
+    }
+  }
+  // a plugin should never exist without a corresponding tag
+  NS_ERROR("TagForPlugin has failed");
+  return nullptr;
+}
+
+nsresult nsPluginHost::SetUpPluginInstance(const nsACString &aMimeType,
+                                           nsIURI *aURL,
+                                           nsPluginInstanceOwner *aOwner)
+{
+  NS_ENSURE_ARG_POINTER(aOwner);
+
+  nsresult rv = TrySetUpPluginInstance(aMimeType, aURL, aOwner);
+  if (NS_SUCCEEDED(rv)) {
+    return rv;
+  }
+
+  // If we failed to load a plugin instance we'll try again after
+  // reloading our plugin list. Only do that once per document to
+  // avoid redundant high resource usage on pages with multiple
+  // unkown instance types. We'll do that by caching the document.
+  nsCOMPtr<nsIDocument> document;
+  aOwner->GetDocument(getter_AddRefs(document));
+
+  nsCOMPtr<nsIDocument> currentdocument = do_QueryReferent(mCurrentDocument);
+  if (document == currentdocument) {
+    return rv;
+  }
+
+  mCurrentDocument = do_GetWeakReference(document);
+
+  // Don't try to set up an instance again if nothing changed.
+  if (ReloadPlugins() == NS_ERROR_PLUGINS_PLUGINSNOTCHANGED) {
+    return rv;
+  }
+
+  return TrySetUpPluginInstance(aMimeType, aURL, aOwner);
+}
+
+nsresult
+nsPluginHost::TrySetUpPluginInstance(const nsACString &aMimeType,
+                                     nsIURI *aURL,
+                                     nsPluginInstanceOwner *aOwner)
+{
+#ifdef PLUGIN_LOGGING
+  MOZ_LOG(nsPluginLogging::gPluginLog, PLUGIN_LOG_NORMAL,
+          ("nsPluginHost::TrySetupPluginInstance Begin mime=%s, owner=%p, url=%s\n",
+           PromiseFlatCString(aMimeType).get(), aOwner,
+           aURL ? aURL->GetSpecOrDefault().get() : ""));
+
+  PR_LogFlush();
+#endif
+
+#ifdef XP_WIN
+  bool changed;
+  if ((mRegKeyHKLM && NS_SUCCEEDED(mRegKeyHKLM->HasChanged(&changed)) && changed) ||
+      (mRegKeyHKCU && NS_SUCCEEDED(mRegKeyHKCU->HasChanged(&changed)) && changed)) {
+    ReloadPlugins();
+  }
+#endif
+
+  RefPtr<nsNPAPIPlugin> plugin;
+  GetPlugin(aMimeType, getter_AddRefs(plugin));
+  if (!plugin) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsPluginTag* pluginTag = FindNativePluginForType(aMimeType, true);
+
+  NS_ASSERTION(pluginTag, "Must have plugin tag here!");
+
+  plugin->GetLibrary()->SetHasLocalInstance();
+
+#if defined(MOZ_WIDGET_ANDROID) && defined(MOZ_CRASHREPORTER)
+  if (pluginTag->mIsFlashPlugin) {
+    CrashReporter::AnnotateCrashReport(NS_LITERAL_CSTRING("FlashVersion"), pluginTag->Version());
+  }
+#endif
+
+  RefPtr<nsNPAPIPluginInstance> instance = new nsNPAPIPluginInstance();
+
+  // This will create the owning reference. The connection must be made between the
+  // instance and the instance owner before initialization. Plugins can call into
+  // the browser during initialization.
+  aOwner->SetInstance(instance.get());
+
+  // Add the instance to the instances list before we call NPP_New so that
+  // it is "in play" before NPP_New happens. Take it out if NPP_New fails.
+  mInstances.AppendElement(instance.get());
+
+  // this should not addref the instance or owner
+  // except in some cases not Java, see bug 140931
+  // our COM pointer will free the peer
+  nsresult rv = instance->Initialize(plugin.get(), aOwner, aMimeType);
+  if (NS_FAILED(rv)) {
+    mInstances.RemoveElement(instance.get());
+    aOwner->SetInstance(nullptr);
+    return rv;
+  }
+
+  // Cancel the plugin unload timer since we are creating
+  // an instance for it.
+  if (pluginTag->mUnloadTimer) {
+    pluginTag->mUnloadTimer->Cancel();
+  }
+
+#ifdef PLUGIN_LOGGING
+  MOZ_LOG(nsPluginLogging::gPluginLog, PLUGIN_LOG_BASIC,
+        ("nsPluginHost::TrySetupPluginInstance Finished mime=%s, rv=%d, owner=%p, url=%s\n",
+         PromiseFlatCString(aMimeType).get(), rv, aOwner,
+         aURL ? aURL->GetSpecOrDefault().get() : ""));
+
+  PR_LogFlush();
+#endif
+
+  return rv;
+}
+
+bool
+nsPluginHost::HavePluginForType(const nsACString & aMimeType,
+                                PluginFilter aFilter)
+{
+  bool checkEnabled = aFilter & eExcludeDisabled;
+  bool allowFake = !(aFilter & eExcludeFake);
+  return FindPluginForType(aMimeType, allowFake, checkEnabled);
+}
+
+nsIInternalPluginTag*
+nsPluginHost::FindPluginForType(const nsACString& aMimeType,
+                                bool aIncludeFake, bool aCheckEnabled)
+{
+  if (aIncludeFake) {
+    nsFakePluginTag* fakeTag = FindFakePluginForType(aMimeType, aCheckEnabled);
+    if (fakeTag) {
+      return fakeTag;
+    }
+  }
+
+  return FindNativePluginForType(aMimeType, aCheckEnabled);
+}
+
+NS_IMETHODIMP
+nsPluginHost::GetPluginTagForType(const nsACString& aMimeType,
+                                  uint32_t aExcludeFlags,
+                                  nsIPluginTag** aResult)
+{
+  bool includeFake = !(aExcludeFlags & eExcludeFake);
+  bool includeDisabled = !(aExcludeFlags & eExcludeDisabled);
+
+  // First look for an enabled plugin.
+  RefPtr<nsIInternalPluginTag> tag = FindPluginForType(aMimeType, includeFake,
+                                                         true);
+  if (!tag && includeDisabled) {
+    tag = FindPluginForType(aMimeType, includeFake, false);
+  }
+
+  if (tag) {
+    tag.forget(aResult);
+    return NS_OK;
+  }
+
+  return NS_ERROR_NOT_AVAILABLE;
+}
+
+NS_IMETHODIMP
+nsPluginHost::GetStateForType(const nsACString &aMimeType,
+                              uint32_t aExcludeFlags,
+                              uint32_t* aResult)
+{
+  nsCOMPtr<nsIPluginTag> tag;
+  nsresult rv = GetPluginTagForType(aMimeType, aExcludeFlags,
+                                    getter_AddRefs(tag));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return tag->GetEnabledState(aResult);
+}
+
+NS_IMETHODIMP
+nsPluginHost::GetBlocklistStateForType(const nsACString &aMimeType,
+                                       uint32_t aExcludeFlags,
+                                       uint32_t *aState)
+{
+  nsCOMPtr<nsIPluginTag> tag;
+  nsresult rv = GetPluginTagForType(aMimeType,
+                                    aExcludeFlags,
+                                    getter_AddRefs(tag));
+  NS_ENSURE_SUCCESS(rv, rv);
+  return tag->GetBlocklistState(aState);
+}
+
+NS_IMETHODIMP
+nsPluginHost::GetPermissionStringForType(const nsACString &aMimeType,
+                                         uint32_t aExcludeFlags,
+                                         nsACString &aPermissionString)
+{
+  nsCOMPtr<nsIPluginTag> tag;
+  nsresult rv = GetPluginTagForType(aMimeType, aExcludeFlags,
+                                    getter_AddRefs(tag));
+  NS_ENSURE_SUCCESS(rv, rv);
+  return GetPermissionStringForTag(tag, aExcludeFlags, aPermissionString);
+}
+
+NS_IMETHODIMP
+nsPluginHost::GetPermissionStringForTag(nsIPluginTag* aTag,
+                                        uint32_t aExcludeFlags,
+                                        nsACString &aPermissionString)
+{
+  NS_ENSURE_TRUE(aTag, NS_ERROR_FAILURE);
+
+  aPermissionString.Truncate();
+  uint32_t blocklistState;
+  nsresult rv = aTag->GetBlocklistState(&blocklistState);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (blocklistState == nsIBlocklistService::STATE_VULNERABLE_UPDATE_AVAILABLE ||
+      blocklistState == nsIBlocklistService::STATE_VULNERABLE_NO_UPDATE) {
+    aPermissionString.AssignLiteral("plugin-vulnerable:");
+  }
+  else {
+    aPermissionString.AssignLiteral("plugin:");
+  }
+
+  nsCString niceName;
+  rv = aTag->GetNiceName(niceName);
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(!niceName.IsEmpty(), NS_ERROR_FAILURE);
+
+  aPermissionString.Append(niceName);
+
+  return NS_OK;
+}
+
+bool
+nsPluginHost::HavePluginForExtension(const nsACString & aExtension,
+                                     /* out */ nsACString & aMimeType,
+                                     PluginFilter aFilter)
+{
+  bool checkEnabled = aFilter & eExcludeDisabled;
+  bool allowFake = !(aFilter & eExcludeFake);
+  return FindNativePluginForExtension(aExtension, aMimeType, checkEnabled) ||
+    (allowFake &&
+     FindFakePluginForExtension(aExtension, aMimeType, checkEnabled));
+}
+
+void
+nsPluginHost::GetPlugins(nsTArray<nsCOMPtr<nsIInternalPluginTag>>& aPluginArray,
+                         bool aIncludeDisabled)
+{
+  aPluginArray.Clear();
+
+  LoadPlugins();
+
+  // Append fake plugins, then normal plugins.
+
+  uint32_t numFake = mFakePlugins.Length();
+  for (uint32_t i = 0; i < numFake; i++) {
+    aPluginArray.AppendElement(mFakePlugins[i]);
+  }
+
+  // Regular plugins
+  nsPluginTag* plugin = mPlugins;
+  while (plugin != nullptr) {
+    if (plugin->IsEnabled() || aIncludeDisabled) {
+      aPluginArray.AppendElement(plugin);
+    }
+    plugin = plugin->mNext;
+  }
+}
+
+// FIXME-jsplugins Check users for order of fake v non-fake
+NS_IMETHODIMP
+nsPluginHost::GetPluginTags(uint32_t* aPluginCount, nsIPluginTag*** aResults)
+{
+  LoadPlugins();
+
+  uint32_t count = 0;
+  uint32_t fakeCount = mFakePlugins.Length();
+  RefPtr<nsPluginTag> plugin = mPlugins;
+  while (plugin != nullptr) {
+    count++;
+    plugin = plugin->mNext;
+  }
+
+  *aResults = static_cast<nsIPluginTag**>
+                         (moz_xmalloc((fakeCount + count) * sizeof(**aResults)));
+  if (!*aResults)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  *aPluginCount = count + fakeCount;
+
+  plugin = mPlugins;
+  for (uint32_t i = 0; i < count; i++) {
+    (*aResults)[i] = plugin;
+    NS_ADDREF((*aResults)[i]);
+    plugin = plugin->mNext;
+  }
+
+  for (uint32_t i = 0; i < fakeCount; i++) {
+    (*aResults)[i + count] = static_cast<nsIInternalPluginTag*>(mFakePlugins[i]);
+    NS_ADDREF((*aResults)[i + count]);
+  }
+
+  return NS_OK;
+}
+
+nsPluginTag*
+nsPluginHost::FindPreferredPlugin(const InfallibleTArray<nsPluginTag*>& matches)
+{
+  // We prefer the plugin with the highest version number.
+  /// XXX(johns): This seems to assume the only time multiple plugins will have
+  ///             the same MIME type is if they're multiple versions of the same
+  ///             plugin -- but since plugin filenames and pretty names can both
+  ///             update, it's probably less arbitrary than just going at it
+  ///             alphabetically.
+
+  if (matches.IsEmpty()) {
+    return nullptr;
+  }
+
+  nsPluginTag *preferredPlugin = matches[0];
+  for (unsigned int i = 1; i < matches.Length(); i++) {
+    if (mozilla::Version(matches[i]->Version().get()) > preferredPlugin->Version().get()) {
+      preferredPlugin = matches[i];
+    }
+  }
+
+  return preferredPlugin;
+}
+
+nsFakePluginTag*
+nsPluginHost::FindFakePluginForExtension(const nsACString & aExtension,
+                                         /* out */ nsACString & aMimeType,
+                                         bool aCheckEnabled)
+{
+  if (aExtension.IsEmpty()) {
+    return nullptr;
+  }
+
+  int32_t numFakePlugins = mFakePlugins.Length();
+  for (int32_t i = 0; i < numFakePlugins; i++) {
+    nsFakePluginTag *plugin = mFakePlugins[i];
+    bool active;
+    if ((!aCheckEnabled ||
+         (NS_SUCCEEDED(plugin->GetActive(&active)) && active)) &&
+        plugin->HasExtension(aExtension, aMimeType)) {
+      return plugin;
+    }
+  }
+
+  return nullptr;
+}
+
+nsFakePluginTag*
+nsPluginHost::FindFakePluginForType(const nsACString & aMimeType,
+                                    bool aCheckEnabled)
+{
+  int32_t numFakePlugins = mFakePlugins.Length();
+  for (int32_t i = 0; i < numFakePlugins; i++) {
+    nsFakePluginTag *plugin = mFakePlugins[i];
+    bool active;
+    if ((!aCheckEnabled ||
+         (NS_SUCCEEDED(plugin->GetActive(&active)) && active)) &&
+        plugin->HasMimeType(aMimeType)) {
+      return plugin;
+    }
+  }
+
+  return nullptr;
+}
+
+nsPluginTag*
+nsPluginHost::FindNativePluginForType(const nsACString & aMimeType,
+                                      bool aCheckEnabled)
+{
+  if (aMimeType.IsEmpty()) {
+    return nullptr;
+  }
+
+  LoadPlugins();
+
+  InfallibleTArray<nsPluginTag*> matchingPlugins;
+
+  nsPluginTag *plugin = mPlugins;
+  while (plugin) {
+    if ((!aCheckEnabled || plugin->IsActive()) &&
+        plugin->HasMimeType(aMimeType)) {
+      matchingPlugins.AppendElement(plugin);
+    }
+    plugin = plugin->mNext;
+  }
+
+  return FindPreferredPlugin(matchingPlugins);
+}
+
+nsPluginTag*
+nsPluginHost::FindNativePluginForExtension(const nsACString & aExtension,
+                                           /* out */ nsACString & aMimeType,
+                                           bool aCheckEnabled)
+{
+  if (aExtension.IsEmpty()) {
+    return nullptr;
+  }
+
+  LoadPlugins();
+
+  InfallibleTArray<nsPluginTag*> matchingPlugins;
+  nsCString matchingMime; // Don't mutate aMimeType unless returning a match
+  nsPluginTag *plugin = mPlugins;
+
+  while (plugin) {
+    if (!aCheckEnabled || plugin->IsActive()) {
+      if (plugin->HasExtension(aExtension, matchingMime)) {
+        matchingPlugins.AppendElement(plugin);
+      }
+    }
+    plugin = plugin->mNext;
+  }
+
+  nsPluginTag *preferredPlugin = FindPreferredPlugin(matchingPlugins);
+  if (!preferredPlugin) {
+    return nullptr;
+  }
+
+  // Re-fetch the matching type because of how FindPreferredPlugin works...
+  preferredPlugin->HasExtension(aExtension, aMimeType);
+  return preferredPlugin;
+}
+
+static nsresult CreateNPAPIPlugin(nsPluginTag *aPluginTag,
+                                  nsNPAPIPlugin **aOutNPAPIPlugin)
+{
+  // If this is an in-process plugin we'll need to load it here if we haven't already.
+  if (!nsNPAPIPlugin::RunPluginOOP(aPluginTag)) {
+    if (aPluginTag->mFullPath.IsEmpty())
+      return NS_ERROR_FAILURE;
+    nsCOMPtr<nsIFile> file = do_CreateInstance("@mozilla.org/file/local;1");
+    file->InitWithPath(NS_ConvertUTF8toUTF16(aPluginTag->mFullPath));
+    nsPluginFile pluginFile(file);
+    PRLibrary* pluginLibrary = nullptr;
+
+    if (NS_FAILED(pluginFile.LoadPlugin(&pluginLibrary)) || !pluginLibrary)
+      return NS_ERROR_FAILURE;
+
+    aPluginTag->mLibrary = pluginLibrary;
+  }
+
+  nsresult rv;
+  rv = nsNPAPIPlugin::CreatePlugin(aPluginTag, aOutNPAPIPlugin);
+
+  return rv;
+}
+
+nsresult nsPluginHost::EnsurePluginLoaded(nsPluginTag* aPluginTag)
+{
+  RefPtr<nsNPAPIPlugin> plugin = aPluginTag->mPlugin;
+  if (!plugin) {
+    nsresult rv = CreateNPAPIPlugin(aPluginTag, getter_AddRefs(plugin));
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    aPluginTag->mPlugin = plugin;
+  }
+  return NS_OK;
+}
+
+nsresult
+nsPluginHost::GetPluginForContentProcess(uint32_t aPluginId, nsNPAPIPlugin** aPlugin)
+{
+  PROFILER_LABEL_FUNC(js::ProfileEntry::Category::OTHER);
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  // If plugins haven't been scanned yet, do so now
+  LoadPlugins();
+
+  nsPluginTag* pluginTag = PluginWithId(aPluginId);
+  if (pluginTag) {
+    // When setting up a bridge, double check with chrome to see if this plugin
+    // is blocked hard. Note this does not protect against vulnerable plugins
+    // that the user has explicitly allowed. :(
+    if (pluginTag->IsBlocklisted()) {
+      return NS_ERROR_PLUGIN_BLOCKLISTED;
+    }
+
+    nsresult rv = EnsurePluginLoaded(pluginTag);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    // We only get here if a content process doesn't have a PluginModuleParent
+    // for the given plugin already. Therefore, this counter is counting the
+    // number of outstanding PluginModuleParents for the plugin, excluding the
+    // one from the chrome process.
+    pluginTag->mContentProcessRunningCount++;
+    NS_ADDREF(*aPlugin = pluginTag->mPlugin);
+    return NS_OK;
+  }
+
+  return NS_ERROR_FAILURE;
+}
+
+class nsPluginUnloadRunnable : public Runnable
+{
+public:
+  explicit nsPluginUnloadRunnable(uint32_t aPluginId) : mPluginId(aPluginId) {}
+
+  NS_IMETHOD Run() override
+  {
+    RefPtr<nsPluginHost> host = nsPluginHost::GetInst();
+    if (!host) {
+      return NS_OK;
+    }
+    nsPluginTag* pluginTag = host->PluginWithId(mPluginId);
+    if (!pluginTag) {
+      return NS_OK;
+    }
+
+    MOZ_ASSERT(pluginTag->mContentProcessRunningCount > 0);
+    pluginTag->mContentProcessRunningCount--;
+
+    if (!pluginTag->mContentProcessRunningCount) {
+      if (!host->IsRunningPlugin(pluginTag)) {
+        pluginTag->TryUnloadPlugin(false);
+      }
+    }
+    return NS_OK;
+  }
+
+protected:
+  uint32_t mPluginId;
+};
+
+void
+nsPluginHost::NotifyContentModuleDestroyed(uint32_t aPluginId)
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  // This is called in response to a message from the plugin. Don't unload the
+  // plugin until the message handler is off the stack.
+  RefPtr<nsPluginUnloadRunnable> runnable =
+    new nsPluginUnloadRunnable(aPluginId);
+  NS_DispatchToMainThread(runnable);
+}
+
+nsresult nsPluginHost::GetPlugin(const nsACString &aMimeType,
+                                 nsNPAPIPlugin** aPlugin)
+{
+  nsresult rv = NS_ERROR_FAILURE;
+  *aPlugin = nullptr;
+
+  // If plugins haven't been scanned yet, do so now
+  LoadPlugins();
+
+  nsPluginTag* pluginTag = FindNativePluginForType(aMimeType, true);
+  if (pluginTag) {
+    rv = NS_OK;
+    PLUGIN_LOG(PLUGIN_LOG_BASIC,
+    ("nsPluginHost::GetPlugin Begin mime=%s, plugin=%s\n",
+     PromiseFlatCString(aMimeType).get(), pluginTag->FileName().get()));
+
+#ifdef DEBUG
+    if (!pluginTag->FileName().IsEmpty())
+      printf("For %s found plugin %s\n",
+             PromiseFlatCString(aMimeType).get(), pluginTag->FileName().get());
+#endif
+
+    rv = EnsurePluginLoaded(pluginTag);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    NS_ADDREF(*aPlugin = pluginTag->mPlugin);
+    return NS_OK;
+  }
+
+  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
+  ("nsPluginHost::GetPlugin End mime=%s, rv=%d, plugin=%p name=%s\n",
+   PromiseFlatCString(aMimeType).get(), rv, *aPlugin,
+   (pluginTag ? pluginTag->FileName().get() : "(not found)")));
+
+  return rv;
+}
+
+// Normalize 'host' to ACE.
+nsresult
+nsPluginHost::NormalizeHostname(nsCString& host)
+{
+  if (IsASCII(host)) {
+    ToLowerCase(host);
+    return NS_OK;
+  }
+
+  if (!mIDNService) {
+    nsresult rv;
+    mIDNService = do_GetService(NS_IDNSERVICE_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return mIDNService->ConvertUTF8toACE(host, host);
+}
+
+// Enumerate a 'sites' array returned by GetSitesWithData and determine if
+// any of them have a base domain in common with 'domain'; if so, append them
+// to the 'result' array. If 'firstMatchOnly' is true, return after finding the
+// first match.
+nsresult
+nsPluginHost::EnumerateSiteData(const nsACString& domain,
+                                const InfallibleTArray<nsCString>& sites,
+                                InfallibleTArray<nsCString>& result,
+                                bool firstMatchOnly)
+{
+  NS_ASSERTION(!domain.IsVoid(), "null domain string");
+
+  nsresult rv;
+  if (!mTLDService) {
+    mTLDService = do_GetService(NS_EFFECTIVETLDSERVICE_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // Get the base domain from the domain.
+  nsCString baseDomain;
+  rv = mTLDService->GetBaseDomainFromHost(domain, 0, baseDomain);
+  bool isIP = rv == NS_ERROR_HOST_IS_IP_ADDRESS;
+  if (isIP || rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
+    // The base domain is the site itself. However, we must be careful to
+    // normalize.
+    baseDomain = domain;
+    rv = NormalizeHostname(baseDomain);
+    NS_ENSURE_SUCCESS(rv, rv);
+  } else if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  // Enumerate the array of sites with data.
+  for (uint32_t i = 0; i < sites.Length(); ++i) {
+    const nsCString& site = sites[i];
+
+    // Check if the site is an IP address.
+    bool siteIsIP =
+      site.Length() >= 2 && site.First() == '[' && site.Last() == ']';
+    if (siteIsIP != isIP)
+      continue;
+
+    nsCString siteBaseDomain;
+    if (siteIsIP) {
+      // Strip the '[]'.
+      siteBaseDomain = Substring(site, 1, site.Length() - 2);
+    } else {
+      // Determine the base domain of the site.
+      rv = mTLDService->GetBaseDomainFromHost(site, 0, siteBaseDomain);
+      if (rv == NS_ERROR_INSUFFICIENT_DOMAIN_LEVELS) {
+        // The base domain is the site itself. However, we must be careful to
+        // normalize.
+        siteBaseDomain = site;
+        rv = NormalizeHostname(siteBaseDomain);
+        NS_ENSURE_SUCCESS(rv, rv);
+      } else if (NS_FAILED(rv)) {
+        return rv;
+      }
+    }
+
+    // At this point, we can do an exact comparison of the two domains.
+    if (baseDomain != siteBaseDomain) {
+      continue;
+    }
+
+    // Append the site to the result array.
+    result.AppendElement(site);
+
+    // If we're supposed to return early, do so.
+    if (firstMatchOnly) {
+      break;
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPluginHost::RegisterFakePlugin(JS::Handle<JS::Value> aInitDictionary,
+                                 JSContext* aCx,
+                                 nsIFakePluginTag **aResult)
+{
+  FakePluginTagInit initDictionary;
+  if (!initDictionary.Init(aCx, aInitDictionary)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<nsFakePluginTag> newTag;
+  nsresult rv = nsFakePluginTag::Create(initDictionary, getter_AddRefs(newTag));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (auto existingTag : mFakePlugins) {
+    if (newTag->HandlerURIMatches(existingTag->HandlerURI())) {
+      return NS_ERROR_UNEXPECTED;
+    }
+  }
+
+  mFakePlugins.AppendElement(newTag);
+  // FIXME-jsplugins do we need to register with the category manager here?  For
+  // shumway, for now, probably not.
+  newTag.forget(aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPluginHost::UnregisterFakePlugin(const nsACString& aHandlerURI)
+{
+  nsCOMPtr<nsIURI> handlerURI;
+  nsresult rv = NS_NewURI(getter_AddRefs(handlerURI), aHandlerURI);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (uint32_t i = 0; i < mFakePlugins.Length(); ++i) {
+    if (mFakePlugins[i]->HandlerURIMatches(handlerURI)) {
+      mFakePlugins.RemoveElementAt(i);
+      return NS_OK;
+    }
+  }
+
+  return NS_OK;
+}
+
+// FIXME-jsplugins Is this method actually needed?
+NS_IMETHODIMP
+nsPluginHost::GetFakePlugin(const nsACString & aMimeType,
+                            nsIFakePluginTag** aResult)
+{
+  RefPtr<nsFakePluginTag> result = FindFakePluginForType(aMimeType, false);
+  if (result) {
+    result.forget(aResult);
+    return NS_OK;
+  }
+
+  *aResult = nullptr;
+  return NS_ERROR_NOT_AVAILABLE;
+}
+
+#define ClearDataFromSitesClosure_CID {0x9fb21761, 0x2403, 0x41ad, {0x9e, 0xfd, 0x36, 0x7e, 0xc4, 0x4f, 0xa4, 0x5e}}
+
+
+// Class to hold all the data we need need for IterateMatchesAndClear and ClearDataFromSites
+class ClearDataFromSitesClosure : public nsIClearSiteDataCallback, public nsIGetSitesWithDataCallback {
+public:
+  ClearDataFromSitesClosure(nsIPluginTag* plugin, const nsACString& domain, uint64_t flags,
+                            int64_t maxAge, nsCOMPtr<nsIClearSiteDataCallback> callback,
+                            nsPluginHost* host) :
+    domain(domain), callback(callback), tag(plugin), flags(flags), maxAge(maxAge), host(host) {}
+  NS_DECL_ISUPPORTS
+
+  // Callback from NPP_ClearSiteData, continue to iterate the matches and clear
+  NS_IMETHOD Callback(nsresult rv) override {
+    if (NS_FAILED(rv)) {
+      callback->Callback(rv);
+      return NS_OK;
+    }
+    if (!matches.Length()) {
+      callback->Callback(NS_OK);
+      return NS_OK;
+    }
+
+    const nsCString match(matches[0]);
+    matches.RemoveElement(match);
+    PluginLibrary* library = static_cast<nsPluginTag*>(tag)->mPlugin->GetLibrary();
+    rv = library->NPP_ClearSiteData(match.get(), flags, maxAge, this);
+    if (NS_FAILED(rv)) {
+      callback->Callback(rv);
+      return NS_OK;
+    }
+    return NS_OK;
+  }
+
+  // Callback from NPP_GetSitesWithData, kick the iteration off to clear the data
+  NS_IMETHOD SitesWithData(InfallibleTArray<nsCString>& sites) override
+  {
+    // Enumerate the sites and build a list of matches.
+    nsresult rv = host->EnumerateSiteData(domain, sites, matches, false);
+    Callback(rv);
+    return NS_OK;
+  }
+
+  nsCString domain;
+  nsCOMPtr<nsIClearSiteDataCallback> callback;
+  InfallibleTArray<nsCString> matches;
+  nsIPluginTag* tag;
+  uint64_t flags;
+  int64_t maxAge;
+  nsPluginHost* host;
+  NS_DECLARE_STATIC_IID_ACCESSOR(ClearDataFromSitesClosure_CID)
+  private:
+  virtual ~ClearDataFromSitesClosure() {}
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(ClearDataFromSitesClosure, ClearDataFromSitesClosure_CID)
+
+NS_IMPL_ADDREF(ClearDataFromSitesClosure)
+NS_IMPL_RELEASE(ClearDataFromSitesClosure)
+
+NS_INTERFACE_MAP_BEGIN(ClearDataFromSitesClosure)
+  NS_INTERFACE_MAP_ENTRY(nsIClearSiteDataCallback)
+  NS_INTERFACE_MAP_ENTRY(nsIGetSitesWithDataCallback)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIClearSiteDataCallback)
+NS_INTERFACE_MAP_END
+
+// FIXME-jsplugins what should this do for fake plugins?
+NS_IMETHODIMP
+nsPluginHost::ClearSiteData(nsIPluginTag* plugin, const nsACString& domain,
+                            uint64_t flags, int64_t maxAge, nsIClearSiteDataCallback* callbackFunc)
+{
+  nsCOMPtr<nsIClearSiteDataCallback> callback(callbackFunc);
+  // maxAge must be either a nonnegative integer or -1.
+  NS_ENSURE_ARG(maxAge >= 0 || maxAge == -1);
+
+  // Caller may give us a tag object that is no longer live.
+  if (!IsLiveTag(plugin)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  nsPluginTag* tag = static_cast<nsPluginTag*>(plugin);
+
+  if (!tag->IsEnabled()) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // We only ensure support for clearing Flash site data for now.
+  // We will also attempt to clear data for any plugin that happens
+  // to be loaded already.
+  if (!tag->mIsFlashPlugin && !tag->mPlugin) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // Make sure the plugin is loaded.
+  nsresult rv = EnsurePluginLoaded(tag);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  PluginLibrary* library = tag->mPlugin->GetLibrary();
+
+  // If 'domain' is the null string, clear everything.
+  if (domain.IsVoid()) {
+    return library->NPP_ClearSiteData(nullptr, flags, maxAge, callback);
+  }
+  nsCOMPtr<nsIGetSitesWithDataCallback> closure(new ClearDataFromSitesClosure(plugin, domain, flags,
+                                                                              maxAge, callback, this));
+  rv = library->NPP_GetSitesWithData(closure);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return NS_OK;
+}
+
+#define GetSitesClosure_CID {0x4c9268ac, 0x2fd1, 0x4f2a, {0x9a, 0x10, 0x7a, 0x09, 0xf1, 0xb7, 0x60, 0x3a}}
+
+// Closure to contain the data needed to handle the callback from NPP_GetSitesWithData
+class GetSitesClosure : public nsIGetSitesWithDataCallback {
+public:
+  NS_DECL_ISUPPORTS
+  GetSitesClosure(const nsACString& domain, nsPluginHost* host)
+  : domain(domain), host(host), keepWaiting(true)
+  {
+  }
+  NS_IMETHOD SitesWithData(InfallibleTArray<nsCString>& sites) override {
+    retVal = HandleGetSites(sites);
+    keepWaiting = false;
+    return NS_OK;
+  }
+
+  nsresult HandleGetSites(InfallibleTArray<nsCString>& sites) {
+    // If there's no data, we're done.
+    if (sites.IsEmpty()) {
+      result = false;
+      return NS_OK;
+    }
+
+    // If 'domain' is the null string, and there's data for at least one site,
+    // we're done.
+    if (domain.IsVoid()) {
+      result = true;
+      return NS_OK;
+    }
+
+    // Enumerate the sites and determine if there's a match.
+    InfallibleTArray<nsCString> matches;
+    nsresult rv = host->EnumerateSiteData(domain, sites, matches, true);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    result = !matches.IsEmpty();
+    return NS_OK;
+  }
+
+  nsCString domain;
+  RefPtr<nsPluginHost> host;
+  bool result;
+  bool keepWaiting;
+  nsresult retVal;
+  NS_DECLARE_STATIC_IID_ACCESSOR(GetSitesClosure_CID)
+  private:
+  virtual ~GetSitesClosure() {
+  }
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(GetSitesClosure, GetSitesClosure_CID)
+
+NS_IMPL_ISUPPORTS(GetSitesClosure, GetSitesClosure, nsIGetSitesWithDataCallback)
+
+// This will spin the event loop while waiting on an async
+// call to GetSitesWithData
+NS_IMETHODIMP
+nsPluginHost::SiteHasData(nsIPluginTag* plugin, const nsACString& domain,
+                          bool* result)
+{
+  // Caller may give us a tag object that is no longer live.
+  if (!IsLiveTag(plugin)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  // FIXME-jsplugins audit casts
+  nsPluginTag* tag = static_cast<nsPluginTag*>(plugin);
+
+  // We only ensure support for clearing Flash site data for now.
+  // We will also attempt to clear data for any plugin that happens
+  // to be loaded already.
+  if (!tag->mIsFlashPlugin && !tag->mPlugin) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // Make sure the plugin is loaded.
+  nsresult rv = EnsurePluginLoaded(tag);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  PluginLibrary* library = tag->mPlugin->GetLibrary();
+
+  // Get the list of sites from the plugin
+  nsCOMPtr<GetSitesClosure> closure(new GetSitesClosure(domain, this));
+  rv = library->NPP_GetSitesWithData(nsCOMPtr<nsIGetSitesWithDataCallback>(do_QueryInterface(closure)));
+  NS_ENSURE_SUCCESS(rv, rv);
+  // Spin the event loop while we wait for the async call to GetSitesWithData
+  while (closure->keepWaiting) {
+    NS_ProcessNextEvent(nullptr, true);
+  }
+  *result = closure->result;
+  return closure->retVal;
+}
+
+nsPluginHost::SpecialType
+nsPluginHost::GetSpecialType(const nsACString & aMIMEType)
+{
+  if (aMIMEType.LowerCaseEqualsASCII("application/x-test")) {
+    return eSpecialType_Test;
+  }
+
+  if (aMIMEType.LowerCaseEqualsASCII("application/x-shockwave-flash") ||
+      aMIMEType.LowerCaseEqualsASCII("application/futuresplash") ||
+      aMIMEType.LowerCaseEqualsASCII("application/x-shockwave-flash-test")) {
+    return eSpecialType_Flash;
+  }
+
+  if (aMIMEType.LowerCaseEqualsASCII("application/x-silverlight") ||
+      aMIMEType.LowerCaseEqualsASCII("application/x-silverlight-2") ||
+      aMIMEType.LowerCaseEqualsASCII("application/x-silverlight-test")) {
+    return eSpecialType_Silverlight;
+  }
+
+  if (aMIMEType.LowerCaseEqualsASCII("audio/x-pn-realaudio-plugin")) {
+    NS_WARNING("You are loading RealPlayer");
+    return eSpecialType_RealPlayer;
+  }
+
+  if (aMIMEType.LowerCaseEqualsASCII("application/pdf")) {
+    return eSpecialType_PDF;
+  }
+
+  if (aMIMEType.LowerCaseEqualsASCII("application/vnd.unity")) {
+    return eSpecialType_Unity;
+  }
+
+  // Java registers variants of its MIME with parameters, e.g.
+  // application/x-java-vm;version=1.3
+  const nsACString &noParam = Substring(aMIMEType, 0, aMIMEType.FindChar(';'));
+
+  // The java mime pref may well not be one of these,
+  // e.g. application/x-java-test used in the test suite
+  nsAdoptingCString javaMIME = Preferences::GetCString(kPrefJavaMIME);
+  if ((!javaMIME.IsEmpty() && noParam.LowerCaseEqualsASCII(javaMIME)) ||
+      noParam.LowerCaseEqualsASCII("application/x-java-vm") ||
+      noParam.LowerCaseEqualsASCII("application/x-java-applet") ||
+      noParam.LowerCaseEqualsASCII("application/x-java-bean")) {
+    return eSpecialType_Java;
+  }
+
+  return eSpecialType_None;
+}
+
+// Check whether or not a tag is a live, valid tag, and that it's loaded.
+bool
+nsPluginHost::IsLiveTag(nsIPluginTag* aPluginTag)
+{
+  nsCOMPtr<nsIInternalPluginTag> internalTag(do_QueryInterface(aPluginTag));
+  uint32_t fakeCount = mFakePlugins.Length();
+  for (uint32_t i = 0; i < fakeCount; i++) {
+    if (mFakePlugins[i] == internalTag) {
+      return true;
+    }
+  }
+
+  nsPluginTag* tag;
+  for (tag = mPlugins; tag; tag = tag->mNext) {
+    if (tag == internalTag) {
+      return true;
+    }
+  }
+  return false;
+}
+
+// FIXME-jsplugins what should happen with jsplugins here, if anything?
+nsPluginTag*
+nsPluginHost::HaveSamePlugin(const nsPluginTag* aPluginTag)
+{
+  for (nsPluginTag* tag = mPlugins; tag; tag = tag->mNext) {
+    if (tag->HasSameNameAndMimes(aPluginTag)) {
+        return tag;
+    }
+  }
+  return nullptr;
+}
+
+// Don't have to worry about fake plugins here, since this is only used during
+// the plugin directory scan, which doesn't pick up fake plugins.
+nsPluginTag*
+nsPluginHost::FirstPluginWithPath(const nsCString& path)
+{
+  for (nsPluginTag* tag = mPlugins; tag; tag = tag->mNext) {
+    if (tag->mFullPath.Equals(path)) {
+      return tag;
+    }
+  }
+  return nullptr;
+}
+
+nsPluginTag*
+nsPluginHost::PluginWithId(uint32_t aId)
+{
+  for (nsPluginTag* tag = mPlugins; tag; tag = tag->mNext) {
+    if (tag->mId == aId) {
+      return tag;
+    }
+  }
+  return nullptr;
+}
+
+namespace {
+
+int64_t GetPluginLastModifiedTime(const nsCOMPtr<nsIFile>& localfile)
+{
+  PRTime fileModTime = 0;
+
+#if defined(XP_MACOSX)
+  // On OS X the date of a bundle's "contents" (i.e. of its Info.plist file)
+  // is a much better guide to when it was last modified than the date of
+  // its package directory.  See bug 313700.
+  nsCOMPtr<nsILocalFileMac> localFileMac = do_QueryInterface(localfile);
+  if (localFileMac) {
+    localFileMac->GetBundleContentsLastModifiedTime(&fileModTime);
+  } else {
+    localfile->GetLastModifiedTime(&fileModTime);
+  }
+#else
+  localfile->GetLastModifiedTime(&fileModTime);
+#endif
+
+  return fileModTime;
+}
+
+bool
+GetPluginIsFromExtension(const nsCOMPtr<nsIFile>& pluginFile,
+                         const nsCOMArray<nsIFile>& extensionDirs)
+{
+  for (uint32_t i = 0; i < extensionDirs.Length(); ++i) {
+    bool contains;
+    if (NS_FAILED(extensionDirs[i]->Contains(pluginFile, &contains)) || !contains) {
+      continue;
+    }
+
+    return true;
+  }
+
+  return false;
+}
+
+void
+GetExtensionDirectories(nsCOMArray<nsIFile>& dirs)
+{
+  nsCOMPtr<nsIProperties> dirService = do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID);
+  if (!dirService) {
+    return;
+  }
+
+  nsCOMPtr<nsISimpleEnumerator> list;
+  nsresult rv = dirService->Get(XRE_EXTENSIONS_DIR_LIST,
+                                NS_GET_IID(nsISimpleEnumerator),
+                                getter_AddRefs(list));
+  if (NS_FAILED(rv)) {
+    return;
+  }
+
+  bool more;
+  while (NS_SUCCEEDED(list->HasMoreElements(&more)) && more) {
+    nsCOMPtr<nsISupports> next;
+    if (NS_FAILED(list->GetNext(getter_AddRefs(next)))) {
+      break;
+    }
+    nsCOMPtr<nsIFile> file = do_QueryInterface(next);
+    if (file) {
+      file->Normalize();
+      dirs.AppendElement(file.forget());
+    }
+  }
+}
+
+struct CompareFilesByTime
+{
+  bool
+  LessThan(const nsCOMPtr<nsIFile>& a, const nsCOMPtr<nsIFile>& b) const
+  {
+    return GetPluginLastModifiedTime(a) < GetPluginLastModifiedTime(b);
+  }
+
+  bool
+  Equals(const nsCOMPtr<nsIFile>& a, const nsCOMPtr<nsIFile>& b) const
+  {
+    return GetPluginLastModifiedTime(a) == GetPluginLastModifiedTime(b);
+  }
+};
+
+} // namespace
+
+bool
+nsPluginHost::ShouldAddPlugin(nsPluginTag* aPluginTag)
+{
+#if defined(XP_WIN) && (defined(__x86_64__) || defined(_M_X64))
+  // On 64-bit windows, the only plugins we should load are flash and
+  // silverlight. Use library filename and MIME type to check.
+  if (StringBeginsWith(aPluginTag->FileName(), NS_LITERAL_CSTRING("NPSWF"), nsCaseInsensitiveCStringComparator()) &&
+      (aPluginTag->HasMimeType(NS_LITERAL_CSTRING("application/x-shockwave-flash")) ||
+       aPluginTag->HasMimeType(NS_LITERAL_CSTRING("application/x-shockwave-flash-test")))) {
+    return true;
+  }
+  if (StringBeginsWith(aPluginTag->FileName(), NS_LITERAL_CSTRING("npctrl"), nsCaseInsensitiveCStringComparator()) &&
+      (aPluginTag->HasMimeType(NS_LITERAL_CSTRING("application/x-silverlight-test")) ||
+       aPluginTag->HasMimeType(NS_LITERAL_CSTRING("application/x-silverlight-2")) ||
+       aPluginTag->HasMimeType(NS_LITERAL_CSTRING("application/x-silverlight")))) {
+    return true;
+  }
+  // Accept the test plugin MIME types, so mochitests still work.
+  if (aPluginTag->HasMimeType(NS_LITERAL_CSTRING("application/x-test")) ||
+      aPluginTag->HasMimeType(NS_LITERAL_CSTRING("application/x-Second-Test")) ||
+      aPluginTag->HasMimeType(NS_LITERAL_CSTRING("application/x-java-test"))) {
+    return true;
+  }
+#ifdef PLUGIN_LOGGING
+  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
+             ("ShouldAddPlugin : Ignoring non-flash plugin library %s\n", aPluginTag->FileName().get()));
+#endif // PLUGIN_LOGGING
+  return false;
+#else
+  return true;
+#endif // defined(XP_WIN) && (defined(__x86_64__) || defined(_M_X64))
+}
+
+void
+nsPluginHost::AddPluginTag(nsPluginTag* aPluginTag)
+{
+  if (!ShouldAddPlugin(aPluginTag)) {
+    return;
+  }
+  aPluginTag->mNext = mPlugins;
+  mPlugins = aPluginTag;
+
+  if (aPluginTag->IsActive()) {
+    nsAdoptingCString disableFullPage =
+      Preferences::GetCString(kPrefDisableFullPage);
+    for (uint32_t i = 0; i < aPluginTag->MimeTypes().Length(); i++) {
+      if (!IsTypeInList(aPluginTag->MimeTypes()[i], disableFullPage)) {
+        RegisterWithCategoryManager(aPluginTag->MimeTypes()[i],
+                                    ePluginRegister);
+      }
+    }
+  }
+}
+
+static bool
+PluginInfoIsFlash(const nsPluginInfo& info)
+{
+  if (!info.fName || strcmp(info.fName, "Shockwave Flash") != 0) {
+    return false;
+  }
+  for (uint32_t i = 0; i < info.fVariantCount; ++i) {
+    if (info.fMimeTypeArray[i] &&
+        (!strcmp(info.fMimeTypeArray[i], "application/x-shockwave-flash") ||
+         !strcmp(info.fMimeTypeArray[i], "application/x-shockwave-flash-test"))) {
+      return true;
+    }
+  }
+  return false;
+}
+
+typedef NS_NPAPIPLUGIN_CALLBACK(char *, NP_GETMIMEDESCRIPTION)(void);
+
+nsresult nsPluginHost::ScanPluginsDirectory(nsIFile *pluginsDir,
+                                            bool aCreatePluginList,
+                                            bool *aPluginsChanged)
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  NS_ENSURE_ARG_POINTER(aPluginsChanged);
+  nsresult rv;
+
+  *aPluginsChanged = false;
+
+#ifdef PLUGIN_LOGGING
+  nsAutoCString dirPath;
+  pluginsDir->GetNativePath(dirPath);
+  PLUGIN_LOG(PLUGIN_LOG_BASIC,
+  ("nsPluginHost::ScanPluginsDirectory dir=%s\n", dirPath.get()));
+#endif
+
+  bool flashOnly = Preferences::GetBool("plugin.load_flash_only", true);
+
+  nsCOMPtr<nsISimpleEnumerator> iter;
+  rv = pluginsDir->GetDirectoryEntries(getter_AddRefs(iter));
+  if (NS_FAILED(rv))
+    return rv;
+
+  AutoTArray<nsCOMPtr<nsIFile>, 6> pluginFiles;
+
+  bool hasMore;
+  while (NS_SUCCEEDED(iter->HasMoreElements(&hasMore)) && hasMore) {
+    nsCOMPtr<nsISupports> supports;
+    rv = iter->GetNext(getter_AddRefs(supports));
+    if (NS_FAILED(rv))
+      continue;
+    nsCOMPtr<nsIFile> dirEntry(do_QueryInterface(supports, &rv));
+    if (NS_FAILED(rv))
+      continue;
+
+    // Sun's JRE 1.3.1 plugin must have symbolic links resolved or else it'll crash.
+    // See bug 197855.
+    dirEntry->Normalize();
+
+    if (nsPluginsDir::IsPluginFile(dirEntry)) {
+      pluginFiles.AppendElement(dirEntry);
+    }
+  }
+
+  pluginFiles.Sort(CompareFilesByTime());
+
+  nsCOMArray<nsIFile> extensionDirs;
+  GetExtensionDirectories(extensionDirs);
+
+  for (int32_t i = (pluginFiles.Length() - 1); i >= 0; i--) {
+    nsCOMPtr<nsIFile>& localfile = pluginFiles[i];
+
+    nsString utf16FilePath;
+    rv = localfile->GetPath(utf16FilePath);
+    if (NS_FAILED(rv))
+      continue;
+
+    const int64_t fileModTime = GetPluginLastModifiedTime(localfile);
+    const bool fromExtension = GetPluginIsFromExtension(localfile, extensionDirs);
+
+    // Look for it in our cache
+    NS_ConvertUTF16toUTF8 filePath(utf16FilePath);
+    RefPtr<nsPluginTag> pluginTag;
+    RemoveCachedPluginsInfo(filePath.get(), getter_AddRefs(pluginTag));
+
+    bool seenBefore = false;
+
+    if (pluginTag) {
+      seenBefore = true;
+      // If plugin changed, delete cachedPluginTag and don't use cache
+      if (fileModTime != pluginTag->mLastModifiedTime) {
+        // Plugins has changed. Don't use cached plugin info.
+        pluginTag = nullptr;
+
+        // plugin file changed, flag this fact
+        *aPluginsChanged = true;
+      }
+
+      // If we're not creating a list and we already know something changed then
+      // we're done.
+      if (!aCreatePluginList) {
+        if (*aPluginsChanged) {
+          return NS_OK;
+        }
+        continue;
+      }
+    }
+
+    bool isKnownInvalidPlugin = false;
+    for (RefPtr<nsInvalidPluginTag> invalidPlugins = mInvalidPlugins;
+         invalidPlugins; invalidPlugins = invalidPlugins->mNext) {
+      // If already marked as invalid, ignore it
+      if (invalidPlugins->mFullPath.Equals(filePath.get()) &&
+          invalidPlugins->mLastModifiedTime == fileModTime) {
+        if (aCreatePluginList) {
+          invalidPlugins->mSeen = true;
+        }
+        isKnownInvalidPlugin = true;
+        break;
+      }
+    }
+    if (isKnownInvalidPlugin) {
+      continue;
+    }
+
+    // if it is not found in cache info list or has been changed, create a new one
+    if (!pluginTag) {
+      nsPluginFile pluginFile(localfile);
+
+      // create a tag describing this plugin.
+      PRLibrary *library = nullptr;
+      nsPluginInfo info;
+      memset(&info, 0, sizeof(info));
+      nsresult res;
+      // Opening a block for the telemetry AutoTimer
+      {
+        Telemetry::AutoTimer<Telemetry::PLUGIN_LOAD_METADATA> telemetry;
+        res = pluginFile.GetPluginInfo(info, &library);
+      }
+      // if we don't have mime type don't proceed, this is not a plugin
+      if (NS_FAILED(res) || !info.fMimeTypeArray ||
+          (flashOnly && !PluginInfoIsFlash(info))) {
+        RefPtr<nsInvalidPluginTag> invalidTag = new nsInvalidPluginTag(filePath.get(),
+                                                                         fileModTime);
+        pluginFile.FreePluginInfo(info);
+
+        if (aCreatePluginList) {
+          invalidTag->mSeen = true;
+        }
+        invalidTag->mNext = mInvalidPlugins;
+        if (mInvalidPlugins) {
+          mInvalidPlugins->mPrev = invalidTag;
+        }
+        mInvalidPlugins = invalidTag;
+
+        // Mark aPluginsChanged so pluginreg is rewritten
+        *aPluginsChanged = true;
+        continue;
+      }
+
+      pluginTag = new nsPluginTag(&info, fileModTime, fromExtension);
+      pluginFile.FreePluginInfo(info);
+      pluginTag->mLibrary = library;
+      uint32_t state;
+      rv = pluginTag->GetBlocklistState(&state);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // If the blocklist says it is risky and we have never seen this
+      // plugin before, then disable it.
+      if (state == nsIBlocklistService::STATE_SOFTBLOCKED && !seenBefore) {
+        pluginTag->SetEnabledState(nsIPluginTag::STATE_DISABLED);
+      }
+
+      // Plugin unloading is tag-based. If we created a new tag and loaded
+      // the library in the process then we want to attempt to unload it here.
+      // Only do this if the pref is set for aggressive unloading.
+      if (UnloadPluginsASAP()) {
+        pluginTag->TryUnloadPlugin(false);
+      }
+    }
+
+    // do it if we still want it
+    if (!seenBefore) {
+      // We have a valid new plugin so report that plugins have changed.
+      *aPluginsChanged = true;
+    }
+
+    // Avoid adding different versions of the same plugin if they are running
+    // in-process, otherwise we risk undefined behaviour.
+    if (!nsNPAPIPlugin::RunPluginOOP(pluginTag)) {
+      if (HaveSamePlugin(pluginTag)) {
+        continue;
+      }
+    }
+
+    // Don't add the same plugin again if it hasn't changed
+    if (nsPluginTag* duplicate = FirstPluginWithPath(pluginTag->mFullPath)) {
+      if (pluginTag->mLastModifiedTime == duplicate->mLastModifiedTime) {
+        continue;
+      }
+    }
+
+    // If we're not creating a plugin list, simply looking for changes,
+    // then we're done.
+    if (!aCreatePluginList) {
+      return NS_OK;
+    }
+
+    AddPluginTag(pluginTag);
+  }
+
+  return NS_OK;
+}
+
+nsresult nsPluginHost::ScanPluginsDirectoryList(nsISimpleEnumerator *dirEnum,
+                                                bool aCreatePluginList,
+                                                bool *aPluginsChanged)
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+    bool hasMore;
+    while (NS_SUCCEEDED(dirEnum->HasMoreElements(&hasMore)) && hasMore) {
+      nsCOMPtr<nsISupports> supports;
+      nsresult rv = dirEnum->GetNext(getter_AddRefs(supports));
+      if (NS_FAILED(rv))
+        continue;
+      nsCOMPtr<nsIFile> nextDir(do_QueryInterface(supports, &rv));
+      if (NS_FAILED(rv))
+        continue;
+
+      // don't pass aPluginsChanged directly to prevent it from been reset
+      bool pluginschanged = false;
+      ScanPluginsDirectory(nextDir, aCreatePluginList, &pluginschanged);
+
+      if (pluginschanged)
+        *aPluginsChanged = true;
+
+      // if changes are detected and we are not creating the list, do not proceed
+      if (!aCreatePluginList && *aPluginsChanged)
+        break;
+    }
+    return NS_OK;
+}
+
+void
+nsPluginHost::IncrementChromeEpoch()
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+  mPluginEpoch++;
+}
+
+uint32_t
+nsPluginHost::ChromeEpoch()
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+  return mPluginEpoch;
+}
+
+uint32_t
+nsPluginHost::ChromeEpochForContent()
+{
+  MOZ_ASSERT(XRE_IsContentProcess());
+  return mPluginEpoch;
+}
+
+void
+nsPluginHost::SetChromeEpochForContent(uint32_t aEpoch)
+{
+  MOZ_ASSERT(XRE_IsContentProcess());
+  mPluginEpoch = aEpoch;
+}
+
+#ifdef XP_WIN
+static void
+WatchRegKey(uint32_t aRoot, nsCOMPtr<nsIWindowsRegKey>& aKey)
+{
+  if (aKey) {
+    return;
+  }
+
+  aKey = do_CreateInstance("@mozilla.org/windows-registry-key;1");
+  if (!aKey) {
+    return;
+  }
+  nsresult rv = aKey->Open(aRoot,
+                           NS_LITERAL_STRING("Software\\MozillaPlugins"),
+                           nsIWindowsRegKey::ACCESS_READ | nsIWindowsRegKey::ACCESS_NOTIFY);
+  if (NS_FAILED(rv)) {
+    aKey = nullptr;
+    return;
+  }
+  aKey->StartWatching(true);
+}
+#endif
+
+nsresult nsPluginHost::LoadPlugins()
+{
+#ifdef ANDROID
+  if (XRE_IsContentProcess()) {
+    return NS_OK;
+  }
+#endif
+  // do not do anything if it is already done
+  // use ReloadPlugins() to enforce loading
+  if (mPluginsLoaded)
+    return NS_OK;
+
+  if (mPluginsDisabled)
+    return NS_OK;
+
+#ifdef XP_WIN
+  WatchRegKey(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE, mRegKeyHKLM);
+  WatchRegKey(nsIWindowsRegKey::ROOT_KEY_CURRENT_USER, mRegKeyHKCU);
+#endif
+
+  bool pluginschanged;
+  nsresult rv = FindPlugins(true, &pluginschanged);
+  if (NS_FAILED(rv))
+    return rv;
+
+  // only if plugins have changed will we notify plugin-change observers
+  if (pluginschanged) {
+    if (XRE_IsParentProcess()) {
+      IncrementChromeEpoch();
+    }
+
+    nsCOMPtr<nsIObserverService> obsService =
+      mozilla::services::GetObserverService();
+    if (obsService)
+      obsService->NotifyObservers(nullptr, "plugins-list-updated", nullptr);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsPluginHost::FindPluginsInContent(bool aCreatePluginList, bool* aPluginsChanged)
+{
+  MOZ_ASSERT(XRE_IsContentProcess());
+
+  dom::ContentChild* cp = dom::ContentChild::GetSingleton();
+  nsresult rv;
+  nsTArray<PluginTag> plugins;
+  uint32_t parentEpoch;
+  if (!cp->SendFindPlugins(ChromeEpochForContent(), &rv, &plugins, &parentEpoch) ||
+      NS_FAILED(rv)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (parentEpoch != ChromeEpochForContent()) {
+    *aPluginsChanged = true;
+    if (!aCreatePluginList) {
+      return NS_OK;
+    }
+
+    // Don't do this if aCreatePluginList is false. Otherwise, when we actually
+    // want to create the list, we'll come back here and do nothing.
+    SetChromeEpochForContent(parentEpoch);
+
+    for (size_t i = 0; i < plugins.Length(); i++) {
+      PluginTag& tag = plugins[i];
+
+      // Don't add the same plugin again.
+      if (nsPluginTag* existing = PluginWithId(tag.id())) {
+        UpdateInMemoryPluginInfo(existing);
+        continue;
+      }
+
+      nsPluginTag *pluginTag = new nsPluginTag(tag.id(),
+                                               tag.name().get(),
+                                               tag.description().get(),
+                                               tag.filename().get(),
+                                               "", // aFullPath
+                                               tag.version().get(),
+                                               nsTArray<nsCString>(tag.mimeTypes()),
+                                               nsTArray<nsCString>(tag.mimeDescriptions()),
+                                               nsTArray<nsCString>(tag.extensions()),
+                                               tag.isJavaPlugin(),
+                                               tag.isFlashPlugin(),
+                                               tag.supportsAsyncInit(),
+                                               tag.supportsAsyncRender(),
+                                               tag.lastModifiedTime(),
+                                               tag.isFromExtension(),
+                                               tag.sandboxLevel());
+      AddPluginTag(pluginTag);
+    }
+  }
+
+  mPluginsLoaded = true;
+  return NS_OK;
+}
+
+// if aCreatePluginList is false we will just scan for plugins
+// and see if any changes have been made to the plugins.
+// This is needed in ReloadPlugins to prevent possible recursive reloads
+nsresult nsPluginHost::FindPlugins(bool aCreatePluginList, bool * aPluginsChanged)
+{
+  Telemetry::AutoTimer<Telemetry::FIND_PLUGINS> telemetry;
+
+  NS_ENSURE_ARG_POINTER(aPluginsChanged);
+
+  *aPluginsChanged = false;
+
+  if (XRE_IsContentProcess()) {
+    return FindPluginsInContent(aCreatePluginList, aPluginsChanged);
+  }
+
+  nsresult rv;
+
+  // Read cached plugins info. If the profile isn't yet available then don't
+  // scan for plugins
+  if (ReadPluginInfo() == NS_ERROR_NOT_AVAILABLE)
+    return NS_OK;
+
+#ifdef XP_WIN
+  // Failure here is not a show-stopper so just warn.
+  rv = EnsurePrivateDirServiceProvider();
+  NS_ASSERTION(NS_SUCCEEDED(rv), "Failed to register dir service provider.");
+#endif /* XP_WIN */
+
+  nsCOMPtr<nsIProperties> dirService(do_GetService(kDirectoryServiceContractID, &rv));
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsCOMPtr<nsISimpleEnumerator> dirList;
+
+  // Scan plugins directories;
+  // don't pass aPluginsChanged directly, to prevent its
+  // possible reset in subsequent ScanPluginsDirectory calls
+  bool pluginschanged = false;
+
+  // Scan the app-defined list of plugin dirs.
+  rv = dirService->Get(NS_APP_PLUGINS_DIR_LIST, NS_GET_IID(nsISimpleEnumerator), getter_AddRefs(dirList));
+  if (NS_SUCCEEDED(rv)) {
+    ScanPluginsDirectoryList(dirList, aCreatePluginList, &pluginschanged);
+
+    if (pluginschanged)
+      *aPluginsChanged = true;
+
+    // if we are just looking for possible changes,
+    // no need to proceed if changes are detected
+    if (!aCreatePluginList && *aPluginsChanged) {
+      NS_ITERATIVE_UNREF_LIST(RefPtr<nsPluginTag>, mCachedPlugins, mNext);
+      NS_ITERATIVE_UNREF_LIST(RefPtr<nsInvalidPluginTag>, mInvalidPlugins, mNext);
+      return NS_OK;
+    }
+  } else {
+#ifdef ANDROID
+    LOG("getting plugins dir failed");
+#endif
+  }
+
+  mPluginsLoaded = true; // at this point 'some' plugins have been loaded,
+                            // the rest is optional
+
+#ifdef XP_WIN
+  bool bScanPLIDs = Preferences::GetBool("plugin.scan.plid.all", false);
+
+    // Now lets scan any PLID directories
+  if (bScanPLIDs && mPrivateDirServiceProvider) {
+    rv = mPrivateDirServiceProvider->GetPLIDDirectories(getter_AddRefs(dirList));
+    if (NS_SUCCEEDED(rv)) {
+      ScanPluginsDirectoryList(dirList, aCreatePluginList, &pluginschanged);
+
+      if (pluginschanged)
+        *aPluginsChanged = true;
+
+      // if we are just looking for possible changes,
+      // no need to proceed if changes are detected
+      if (!aCreatePluginList && *aPluginsChanged) {
+        NS_ITERATIVE_UNREF_LIST(RefPtr<nsPluginTag>, mCachedPlugins, mNext);
+        NS_ITERATIVE_UNREF_LIST(RefPtr<nsInvalidPluginTag>, mInvalidPlugins, mNext);
+        return NS_OK;
+      }
+    }
+  }
+
+
+  // Scan the installation paths of our popular plugins if the prefs are enabled
+
+  // This table controls the order of scanning
+  const char* const prefs[] = {NS_WIN_ACROBAT_SCAN_KEY,
+                               NS_WIN_QUICKTIME_SCAN_KEY,
+                               NS_WIN_WMP_SCAN_KEY};
+
+  uint32_t size = sizeof(prefs) / sizeof(prefs[0]);
+
+  for (uint32_t i = 0; i < size; i+=1) {
+    nsCOMPtr<nsIFile> dirToScan;
+    bool bExists;
+    if (NS_SUCCEEDED(dirService->Get(prefs[i], NS_GET_IID(nsIFile), getter_AddRefs(dirToScan))) &&
+        dirToScan &&
+        NS_SUCCEEDED(dirToScan->Exists(&bExists)) &&
+        bExists) {
+
+      ScanPluginsDirectory(dirToScan, aCreatePluginList, &pluginschanged);
+
+      if (pluginschanged)
+        *aPluginsChanged = true;
+
+      // if we are just looking for possible changes,
+      // no need to proceed if changes are detected
+      if (!aCreatePluginList && *aPluginsChanged) {
+        NS_ITERATIVE_UNREF_LIST(RefPtr<nsPluginTag>, mCachedPlugins, mNext);
+        NS_ITERATIVE_UNREF_LIST(RefPtr<nsInvalidPluginTag>, mInvalidPlugins, mNext);
+        return NS_OK;
+      }
+    }
+  }
+#endif
+
+  // We should also consider plugins to have changed if any plugins have been removed.
+  // We'll know if any were removed if they weren't taken out of the cached plugins list
+  // during our scan, thus we can assume something was removed if the cached plugins list
+  // contains anything.
+  if (!*aPluginsChanged && mCachedPlugins) {
+    *aPluginsChanged = true;
+  }
+
+  // Remove unseen invalid plugins
+  RefPtr<nsInvalidPluginTag> invalidPlugins = mInvalidPlugins;
+  while (invalidPlugins) {
+    if (!invalidPlugins->mSeen) {
+      RefPtr<nsInvalidPluginTag> invalidPlugin = invalidPlugins;
+
+      if (invalidPlugin->mPrev) {
+        invalidPlugin->mPrev->mNext = invalidPlugin->mNext;
+      }
+      else {
+        mInvalidPlugins = invalidPlugin->mNext;
+      }
+      if (invalidPlugin->mNext) {
+        invalidPlugin->mNext->mPrev = invalidPlugin->mPrev;
+      }
+
+      invalidPlugins = invalidPlugin->mNext;
+
+      invalidPlugin->mPrev = nullptr;
+      invalidPlugin->mNext = nullptr;
+    }
+    else {
+      invalidPlugins->mSeen = false;
+      invalidPlugins = invalidPlugins->mNext;
+    }
+  }
+
+  // if we are not creating the list, there is no need to proceed
+  if (!aCreatePluginList) {
+    NS_ITERATIVE_UNREF_LIST(RefPtr<nsPluginTag>, mCachedPlugins, mNext);
+    NS_ITERATIVE_UNREF_LIST(RefPtr<nsInvalidPluginTag>, mInvalidPlugins, mNext);
+    return NS_OK;
+  }
+
+  // if we are creating the list, it is already done;
+  // update the plugins info cache if changes are detected
+  if (*aPluginsChanged)
+    WritePluginInfo();
+
+  // No more need for cached plugins. Clear it up.
+  NS_ITERATIVE_UNREF_LIST(RefPtr<nsPluginTag>, mCachedPlugins, mNext);
+  NS_ITERATIVE_UNREF_LIST(RefPtr<nsInvalidPluginTag>, mInvalidPlugins, mNext);
+
+  return NS_OK;
+}
+
+nsresult
+mozilla::plugins::FindPluginsForContent(uint32_t aPluginEpoch,
+                                        nsTArray<PluginTag>* aPlugins,
+                                        uint32_t* aNewPluginEpoch)
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  RefPtr<nsPluginHost> host = nsPluginHost::GetInst();
+  return host->FindPluginsForContent(aPluginEpoch, aPlugins, aNewPluginEpoch);
+}
+
+nsresult
+nsPluginHost::FindPluginsForContent(uint32_t aPluginEpoch,
+                                    nsTArray<PluginTag>* aPlugins,
+                                    uint32_t* aNewPluginEpoch)
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  // Load plugins so that the epoch is correct.
+  nsresult rv = LoadPlugins();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  *aNewPluginEpoch = ChromeEpoch();
+  if (aPluginEpoch == ChromeEpoch()) {
+    return NS_OK;
+  }
+
+  nsTArray<nsCOMPtr<nsIInternalPluginTag>> plugins;
+  GetPlugins(plugins, true);
+
+  for (size_t i = 0; i < plugins.Length(); i++) {
+    nsCOMPtr<nsIInternalPluginTag> basetag = plugins[i];
+
+    nsCOMPtr<nsIFakePluginTag> faketag = do_QueryInterface(basetag);
+    if (faketag) {
+      /// FIXME-jsplugins - We need to make content processes properly
+      /// aware of jsplugins (and add a nsIInternalPluginTag->AsNative() to
+      /// avoid this hacky static cast)
+      continue;
+    }
+
+    /// FIXME-jsplugins - We need to cleanup the various plugintag classes
+    /// to be more sane and avoid this dance
+    nsPluginTag *tag = static_cast<nsPluginTag *>(basetag.get());
+
+    aPlugins->AppendElement(PluginTag(tag->mId,
+                                      tag->Name(),
+                                      tag->Description(),
+                                      tag->MimeTypes(),
+                                      tag->MimeDescriptions(),
+                                      tag->Extensions(),
+                                      tag->mIsJavaPlugin,
+                                      tag->mIsFlashPlugin,
+                                      tag->mSupportsAsyncInit,
+                                      tag->mSupportsAsyncRender,
+                                      tag->FileName(),
+                                      tag->Version(),
+                                      tag->mLastModifiedTime,
+                                      tag->IsFromExtension(),
+                                      tag->mSandboxLevel));
+  }
+  return NS_OK;
+}
+
+void
+nsPluginHost::UpdateInMemoryPluginInfo(nsPluginTag* aPluginTag)
+{
+  NS_ITERATIVE_UNREF_LIST(RefPtr<nsPluginTag>, mCachedPlugins, mNext);
+  NS_ITERATIVE_UNREF_LIST(RefPtr<nsInvalidPluginTag>, mInvalidPlugins, mNext);
+
+  if (!aPluginTag) {
+    return;
+  }
+
+  // Update types with category manager
+  nsAdoptingCString disableFullPage =
+    Preferences::GetCString(kPrefDisableFullPage);
+  for (uint32_t i = 0; i < aPluginTag->MimeTypes().Length(); i++) {
+    nsRegisterType shouldRegister;
+
+    if (IsTypeInList(aPluginTag->MimeTypes()[i], disableFullPage)) {
+      shouldRegister = ePluginUnregister;
+    } else {
+      nsPluginTag *plugin = FindNativePluginForType(aPluginTag->MimeTypes()[i],
+                                                    true);
+      shouldRegister = plugin ? ePluginRegister : ePluginUnregister;
+    }
+
+    RegisterWithCategoryManager(aPluginTag->MimeTypes()[i], shouldRegister);
+  }
+
+  nsCOMPtr<nsIObserverService> obsService =
+    mozilla::services::GetObserverService();
+  if (obsService)
+    obsService->NotifyObservers(nullptr, "plugin-info-updated", nullptr);
+}
+
+// This function is not relevant for fake plugins.
+void
+nsPluginHost::UpdatePluginInfo(nsPluginTag* aPluginTag)
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  ReadPluginInfo();
+  WritePluginInfo();
+
+  IncrementChromeEpoch();
+
+  UpdateInMemoryPluginInfo(aPluginTag);
+}
+
+/* static */ bool
+nsPluginHost::IsTypeWhitelisted(const char *aMimeType)
+{
+  nsAdoptingCString whitelist = Preferences::GetCString(kPrefWhitelist);
+  if (!whitelist.Length()) {
+    return true;
+  }
+  nsDependentCString wrap(aMimeType);
+  return IsTypeInList(wrap, whitelist);
+}
+
+/* static */ bool
+nsPluginHost::ShouldLoadTypeInParent(const nsACString& aMimeType)
+{
+  nsCString prefName(kPrefLoadInParentPrefix);
+  prefName += aMimeType;
+  return Preferences::GetBool(prefName.get(), false);
+}
+
+void
+nsPluginHost::RegisterWithCategoryManager(const nsCString& aMimeType,
+                                          nsRegisterType aType)
+{
+  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
+             ("nsPluginTag::RegisterWithCategoryManager type = %s, removing = %s\n",
+              aMimeType.get(), aType == ePluginUnregister ? "yes" : "no"));
+
+  nsCOMPtr<nsICategoryManager> catMan =
+    do_GetService(NS_CATEGORYMANAGER_CONTRACTID);
+  if (!catMan) {
+    return;
+  }
+
+  const char *contractId =
+    "@mozilla.org/content/plugin/document-loader-factory;1";
+
+  if (aType == ePluginRegister) {
+    catMan->AddCategoryEntry("Gecko-Content-Viewers",
+                             aMimeType.get(),
+                             contractId,
+                             false, /* persist: broken by bug 193031 */
+                             mOverrideInternalTypes,
+                             nullptr);
+  } else {
+    if (aType == ePluginMaybeUnregister) {
+      // Bail out if this type is still used by an enabled plugin
+      if (HavePluginForType(aMimeType)) {
+        return;
+      }
+    } else {
+      MOZ_ASSERT(aType == ePluginUnregister, "Unknown nsRegisterType");
+    }
+
+    // Only delete the entry if a plugin registered for it
+    nsXPIDLCString value;
+    nsresult rv = catMan->GetCategoryEntry("Gecko-Content-Viewers",
+                                           aMimeType.get(),
+                                           getter_Copies(value));
+    if (NS_SUCCEEDED(rv) && strcmp(value, contractId) == 0) {
+      catMan->DeleteCategoryEntry("Gecko-Content-Viewers",
+                                  aMimeType.get(),
+                                  true);
+    }
+  }
+}
+
+nsresult
+nsPluginHost::WritePluginInfo()
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID,&rv));
+  if (NS_FAILED(rv))
+    return rv;
+
+  directoryService->Get(NS_APP_USER_PROFILE_50_DIR, NS_GET_IID(nsIFile),
+                        getter_AddRefs(mPluginRegFile));
+
+  if (!mPluginRegFile)
+    return NS_ERROR_FAILURE;
+
+  PRFileDesc* fd = nullptr;
+
+  nsCOMPtr<nsIFile> pluginReg;
+
+  rv = mPluginRegFile->Clone(getter_AddRefs(pluginReg));
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsAutoCString filename(kPluginRegistryFilename);
+  filename.AppendLiteral(".tmp");
+  rv = pluginReg->AppendNative(filename);
+  if (NS_FAILED(rv))
+    return rv;
+
+  rv = pluginReg->OpenNSPRFileDesc(PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE, 0600, &fd);
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsCOMPtr<nsIXULRuntime> runtime = do_GetService("@mozilla.org/xre/runtime;1");
+  if (!runtime) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsAutoCString arch;
+  rv = runtime->GetXPCOMABI(arch);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  bool flashOnly = Preferences::GetBool("plugin.load_flash_only", true);
+
+  PR_fprintf(fd, "Generated File. Do not edit.\n");
+
+  PR_fprintf(fd, "\n[HEADER]\nVersion%c%s%c%c%c\nArch%c%s%c%c\n",
+             PLUGIN_REGISTRY_FIELD_DELIMITER,
+             kPluginRegistryVersion,
+             flashOnly ? 't' : 'f',
+             PLUGIN_REGISTRY_FIELD_DELIMITER,
+             PLUGIN_REGISTRY_END_OF_LINE_MARKER,
+             PLUGIN_REGISTRY_FIELD_DELIMITER,
+             arch.get(),
+             PLUGIN_REGISTRY_FIELD_DELIMITER,
+             PLUGIN_REGISTRY_END_OF_LINE_MARKER);
+
+  // Store all plugins in the mPlugins list - all plugins currently in use.
+  PR_fprintf(fd, "\n[PLUGINS]\n");
+
+  for (nsPluginTag *tag = mPlugins; tag; tag = tag->mNext) {
+    // store each plugin info into the registry
+    // filename & fullpath are on separate line
+    // because they can contain field delimiter char
+    PR_fprintf(fd, "%s%c%c\n%s%c%c\n%s%c%c\n",
+      (tag->FileName().get()),
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      PLUGIN_REGISTRY_END_OF_LINE_MARKER,
+      (tag->mFullPath.get()),
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      PLUGIN_REGISTRY_END_OF_LINE_MARKER,
+      (tag->Version().get()),
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      PLUGIN_REGISTRY_END_OF_LINE_MARKER);
+
+    // lastModifiedTimeStamp|canUnload|tag->mFlags|fromExtension
+    PR_fprintf(fd, "%lld%c%d%c%lu%c%d%c%c\n",
+      tag->mLastModifiedTime,
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      false, // did store whether or not to unload in-process plugins
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      0, // legacy field for flags
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      tag->IsFromExtension(),
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      PLUGIN_REGISTRY_END_OF_LINE_MARKER);
+
+    //description, name & mtypecount are on separate line
+    PR_fprintf(fd, "%s%c%c\n%s%c%c\n%d\n",
+      (tag->Description().get()),
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      PLUGIN_REGISTRY_END_OF_LINE_MARKER,
+      (tag->Name().get()),
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      PLUGIN_REGISTRY_END_OF_LINE_MARKER,
+      tag->MimeTypes().Length());
+
+    // Add in each mimetype this plugin supports
+    for (uint32_t i = 0; i < tag->MimeTypes().Length(); i++) {
+      PR_fprintf(fd, "%d%c%s%c%s%c%s%c%c\n",
+        i,PLUGIN_REGISTRY_FIELD_DELIMITER,
+        (tag->MimeTypes()[i].get()),
+        PLUGIN_REGISTRY_FIELD_DELIMITER,
+        (tag->MimeDescriptions()[i].get()),
+        PLUGIN_REGISTRY_FIELD_DELIMITER,
+        (tag->Extensions()[i].get()),
+        PLUGIN_REGISTRY_FIELD_DELIMITER,
+        PLUGIN_REGISTRY_END_OF_LINE_MARKER);
+    }
+  }
+
+  PR_fprintf(fd, "\n[INVALID]\n");
+
+  RefPtr<nsInvalidPluginTag> invalidPlugins = mInvalidPlugins;
+  while (invalidPlugins) {
+    // fullPath
+    PR_fprintf(fd, "%s%c%c\n",
+      (!invalidPlugins->mFullPath.IsEmpty() ? invalidPlugins->mFullPath.get() : ""),
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      PLUGIN_REGISTRY_END_OF_LINE_MARKER);
+
+    // lastModifiedTimeStamp
+    PR_fprintf(fd, "%lld%c%c\n",
+      invalidPlugins->mLastModifiedTime,
+      PLUGIN_REGISTRY_FIELD_DELIMITER,
+      PLUGIN_REGISTRY_END_OF_LINE_MARKER);
+
+    invalidPlugins = invalidPlugins->mNext;
+  }
+
+  PRStatus prrc;
+  prrc = PR_Close(fd);
+  if (prrc != PR_SUCCESS) {
+    // we should obtain a refined value based on prrc;
+    rv = NS_ERROR_FAILURE;
+    MOZ_ASSERT(false, "PR_Close() failed.");
+    return rv;
+  }
+  nsCOMPtr<nsIFile> parent;
+  rv = pluginReg->GetParent(getter_AddRefs(parent));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = pluginReg->MoveToNative(parent, kPluginRegistryFilename);
+  return rv;
+}
+
+nsresult
+nsPluginHost::ReadPluginInfo()
+{
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  const long PLUGIN_REG_MIMETYPES_ARRAY_SIZE = 12;
+  const long PLUGIN_REG_MAX_MIMETYPES = 1000;
+
+  nsresult rv;
+
+  nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID,&rv));
+  if (NS_FAILED(rv))
+    return rv;
+
+  directoryService->Get(NS_APP_USER_PROFILE_50_DIR, NS_GET_IID(nsIFile),
+                        getter_AddRefs(mPluginRegFile));
+
+  if (!mPluginRegFile) {
+    // There is no profile yet, this will tell us if there is going to be one
+    // in the future.
+    directoryService->Get(NS_APP_PROFILE_DIR_STARTUP, NS_GET_IID(nsIFile),
+                          getter_AddRefs(mPluginRegFile));
+    if (!mPluginRegFile)
+      return NS_ERROR_FAILURE;
+    else
+      return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  PRFileDesc* fd = nullptr;
+
+  nsCOMPtr<nsIFile> pluginReg;
+
+  rv = mPluginRegFile->Clone(getter_AddRefs(pluginReg));
+  if (NS_FAILED(rv))
+    return rv;
+
+  rv = pluginReg->AppendNative(kPluginRegistryFilename);
+  if (NS_FAILED(rv))
+    return rv;
+
+  int64_t fileSize;
+  rv = pluginReg->GetFileSize(&fileSize);
+  if (NS_FAILED(rv))
+    return rv;
+
+  if (fileSize > INT32_MAX) {
+    return NS_ERROR_FAILURE;
+  }
+  int32_t flen = int32_t(fileSize);
+  if (flen == 0) {
+    NS_WARNING("Plugins Registry Empty!");
+    return NS_OK; // ERROR CONDITION
+  }
+
+  nsPluginManifestLineReader reader;
+  char* registry = reader.Init(flen);
+  if (!registry)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  rv = pluginReg->OpenNSPRFileDesc(PR_RDONLY, 0444, &fd);
+  if (NS_FAILED(rv))
+    return rv;
+
+  // set rv to return an error on goto out
+  rv = NS_ERROR_FAILURE;
+
+  // We know how many octes we are supposed to read.
+  // So let use the busy_beaver_PR_Read version.
+  int32_t bread = busy_beaver_PR_Read(fd, registry, flen);
+
+  PRStatus prrc;
+  prrc = PR_Close(fd);
+  if (prrc != PR_SUCCESS) {
+    // Strange error: this is one of those "Should not happen" error.
+    // we may want to report something more refined than  NS_ERROR_FAILURE.
+    MOZ_ASSERT(false, "PR_Close() failed.");
+    return rv;
+  }
+
+  // short read error, so to speak.
+  if (flen > bread)
+    return rv;
+
+  if (!ReadSectionHeader(reader, "HEADER"))
+    return rv;;
+
+  if (!reader.NextLine())
+    return rv;
+
+  char* values[6];
+
+  // VersionLiteral, kPluginRegistryVersion
+  if (2 != reader.ParseLine(values, 2))
+    return rv;
+
+  // VersionLiteral
+  if (PL_strcmp(values[0], "Version"))
+    return rv;
+
+  // If we're reading an old registry, ignore it
+  // If we flipped the flash-only pref, ignore it
+  bool flashOnly = Preferences::GetBool("plugin.load_flash_only", true);
+  nsAutoCString expectedVersion(kPluginRegistryVersion);
+  expectedVersion.Append(flashOnly ? 't' : 'f');
+
+  if (!expectedVersion.Equals(values[1])) {
+    return rv;
+  }
+
+  char* archValues[6];
+  if (!reader.NextLine()) {
+    return rv;
+  }
+
+  // ArchLiteral, Architecture
+  if (2 != reader.ParseLine(archValues, 2)) {
+    return rv;
+  }
+
+  // ArchLiteral
+  if (PL_strcmp(archValues[0], "Arch")) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIXULRuntime> runtime = do_GetService("@mozilla.org/xre/runtime;1");
+  if (!runtime) {
+    return rv;
+  }
+
+  nsAutoCString arch;
+  if (NS_FAILED(runtime->GetXPCOMABI(arch))) {
+    return rv;
+  }
+
+  // If this is a registry from a different architecture then don't attempt to read it
+  if (PL_strcmp(archValues[1], arch.get())) {
+    return rv;
+  }
+
+  if (!ReadSectionHeader(reader, "PLUGINS"))
+    return rv;
+
+  while (reader.NextLine()) {
+    if (*reader.LinePtr() == '[') {
+      break;
+    }
+
+    const char* filename = reader.LinePtr();
+    if (!reader.NextLine())
+      return rv;
+
+    const char* fullpath = reader.LinePtr();
+    if (!reader.NextLine())
+      return rv;
+
+    const char *version;
+    version = reader.LinePtr();
+    if (!reader.NextLine())
+      return rv;
+
+    // lastModifiedTimeStamp|canUnload|tag.mFlag|fromExtension
+    if (4 != reader.ParseLine(values, 4))
+      return rv;
+
+    int64_t lastmod = nsCRT::atoll(values[0]);
+    bool fromExtension = atoi(values[3]);
+    if (!reader.NextLine())
+      return rv;
+
+    char *description = reader.LinePtr();
+    if (!reader.NextLine())
+      return rv;
+
+#if MOZ_WIDGET_ANDROID
+    // Flash on Android does not populate the version field, but it is tacked on to the description.
+    // For example, "Shockwave Flash 11.1 r115"
+    if (PL_strncmp("Shockwave Flash ", description, 16) == 0 && description[16]) {
+      version = &description[16];
+    }
+#endif
+
+    const char *name = reader.LinePtr();
+    if (!reader.NextLine())
+      return rv;
+
+    long mimetypecount = std::strtol(reader.LinePtr(), nullptr, 10);
+    if (mimetypecount == LONG_MAX || mimetypecount == LONG_MIN ||
+        mimetypecount >= PLUGIN_REG_MAX_MIMETYPES || mimetypecount < 0) {
+      return NS_ERROR_FAILURE;
+    }
+
+    char *stackalloced[PLUGIN_REG_MIMETYPES_ARRAY_SIZE * 3];
+    char **mimetypes;
+    char **mimedescriptions;
+    char **extensions;
+    char **heapalloced = 0;
+    if (mimetypecount > PLUGIN_REG_MIMETYPES_ARRAY_SIZE - 1) {
+      heapalloced = new char *[mimetypecount * 3];
+      mimetypes = heapalloced;
+    } else {
+      mimetypes = stackalloced;
+    }
+    mimedescriptions = mimetypes + mimetypecount;
+    extensions = mimedescriptions + mimetypecount;
+
+    int mtr = 0; //mimetype read
+    for (; mtr < mimetypecount; mtr++) {
+      if (!reader.NextLine())
+        break;
+
+      //line number|mimetype|description|extension
+      if (4 != reader.ParseLine(values, 4))
+        break;
+      int line = atoi(values[0]);
+      if (line != mtr)
+        break;
+      mimetypes[mtr] = values[1];
+      mimedescriptions[mtr] = values[2];
+      extensions[mtr] = values[3];
+    }
+
+    if (mtr != mimetypecount) {
+      if (heapalloced) {
+        delete [] heapalloced;
+      }
+      return rv;
+    }
+
+    RefPtr<nsPluginTag> tag = new nsPluginTag(name,
+      description,
+      filename,
+      fullpath,
+      version,
+      (const char* const*)mimetypes,
+      (const char* const*)mimedescriptions,
+      (const char* const*)extensions,
+      mimetypecount, lastmod, fromExtension, true);
+    if (heapalloced)
+      delete [] heapalloced;
+
+    // Import flags from registry into prefs for old registry versions
+    MOZ_LOG(nsPluginLogging::gPluginLog, PLUGIN_LOG_BASIC,
+      ("LoadCachedPluginsInfo : Loading Cached plugininfo for %s\n", tag->FileName().get()));
+
+    if (!ShouldAddPlugin(tag)) {
+      continue;
+    }
+
+    tag->mNext = mCachedPlugins;
+    mCachedPlugins = tag;
+  }
+
+// On Android we always want to try to load a plugin again (Flash). Bug 935676.
+#ifndef MOZ_WIDGET_ANDROID
+  if (!ReadSectionHeader(reader, "INVALID")) {
+    return rv;
+  }
+
+  while (reader.NextLine()) {
+    const char *fullpath = reader.LinePtr();
+    if (!reader.NextLine()) {
+      return rv;
+    }
+
+    const char *lastModifiedTimeStamp = reader.LinePtr();
+    int64_t lastmod = nsCRT::atoll(lastModifiedTimeStamp);
+
+    RefPtr<nsInvalidPluginTag> invalidTag = new nsInvalidPluginTag(fullpath, lastmod);
+
+    invalidTag->mNext = mInvalidPlugins;
+    if (mInvalidPlugins) {
+      mInvalidPlugins->mPrev = invalidTag;
+    }
+    mInvalidPlugins = invalidTag;
+  }
+#endif
+
+  return NS_OK;
+}
+
+void
+nsPluginHost::RemoveCachedPluginsInfo(const char *filePath, nsPluginTag **result)
+{
+  RefPtr<nsPluginTag> prev;
+  RefPtr<nsPluginTag> tag = mCachedPlugins;
+  while (tag)
+  {
+    if (tag->mFullPath.Equals(filePath)) {
+      // Found it. Remove it from our list
+      if (prev)
+        prev->mNext = tag->mNext;
+      else
+        mCachedPlugins = tag->mNext;
+      tag->mNext = nullptr;
+      *result = tag;
+      NS_ADDREF(*result);
+      break;
+    }
+    prev = tag;
+    tag = tag->mNext;
+  }
+}
+
+#ifdef XP_WIN
+nsresult
+nsPluginHost::EnsurePrivateDirServiceProvider()
+{
+  if (!mPrivateDirServiceProvider) {
+    nsresult rv;
+    mPrivateDirServiceProvider = new nsPluginDirServiceProvider();
+    nsCOMPtr<nsIDirectoryService> dirService(do_GetService(kDirectoryServiceContractID, &rv));
+    if (NS_FAILED(rv))
+      return rv;
+    rv = dirService->RegisterProvider(mPrivateDirServiceProvider);
+    if (NS_FAILED(rv))
+      return rv;
+  }
+  return NS_OK;
+}
+#endif /* XP_WIN */
+
+nsresult nsPluginHost::NewPluginURLStream(const nsString& aURL,
+                                          nsNPAPIPluginInstance *aInstance,
+                                          nsNPAPIPluginStreamListener* aListener,
+                                          nsIInputStream *aPostStream,
+                                          const char *aHeadersData,
+                                          uint32_t aHeadersDataLen)
+{
+  nsCOMPtr<nsIURI> url;
+  nsAutoString absUrl;
+  nsresult rv;
+
+  if (aURL.Length() <= 0)
+    return NS_OK;
+
+  // get the base URI for the plugin to create an absolute url
+  // in case aURL is relative
+  RefPtr<nsPluginInstanceOwner> owner = aInstance->GetOwner();
+  if (owner) {
+    nsCOMPtr<nsIURI> baseURI = owner->GetBaseURI();
+    rv = NS_MakeAbsoluteURI(absUrl, aURL, baseURI);
+  }
+
+  if (absUrl.IsEmpty())
+    absUrl.Assign(aURL);
+
+  rv = NS_NewURI(getter_AddRefs(url), absUrl);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  RefPtr<nsPluginStreamListenerPeer> listenerPeer = new nsPluginStreamListenerPeer();
+  NS_ENSURE_TRUE(listenerPeer, NS_ERROR_OUT_OF_MEMORY);
+
+  rv = listenerPeer->Initialize(url, aInstance, aListener);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIDOMElement> element;
+  nsCOMPtr<nsIDocument> doc;
+  if (owner) {
+    owner->GetDOMElement(getter_AddRefs(element));
+    owner->GetDocument(getter_AddRefs(doc));
+  }
+
+  nsCOMPtr<nsINode> requestingNode(do_QueryInterface(element));
+  NS_ENSURE_TRUE(requestingNode, NS_ERROR_FAILURE);
+
+  nsCOMPtr<nsIChannel> channel;
+  // @arg loadgroup:
+  // do not add this internal plugin's channel on the
+  // load group otherwise this channel could be canceled
+  // form |nsDocShell::OnLinkClickSync| bug 166613
+  rv = NS_NewChannel(getter_AddRefs(channel),
+                     url,
+                     requestingNode,
+                     nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS |
+                     nsILoadInfo::SEC_FORCE_INHERIT_PRINCIPAL,
+                     nsIContentPolicy::TYPE_OBJECT_SUBREQUEST,
+                     nullptr,  // aLoadGroup
+                     listenerPeer,
+                     nsIRequest::LOAD_NORMAL | nsIChannel::LOAD_CLASSIFY_URI |
+                     nsIChannel::LOAD_BYPASS_SERVICE_WORKER);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (doc) {
+    // And if it's a script allow it to execute against the
+    // document's script context.
+    nsCOMPtr<nsIScriptChannel> scriptChannel(do_QueryInterface(channel));
+    if (scriptChannel) {
+      scriptChannel->SetExecutionPolicy(nsIScriptChannel::EXECUTE_NORMAL);
+      // Plug-ins seem to depend on javascript: URIs running synchronously
+      scriptChannel->SetExecuteAsync(false);
+    }
+  }
+
+  // deal with headers and post data
+  nsCOMPtr<nsIHttpChannel> httpChannel(do_QueryInterface(channel));
+  if (httpChannel) {
+    if (!aPostStream) {
+      // Only set the Referer header for GET requests because IIS throws
+      // errors about malformed requests if we include it in POSTs. See
+      // bug 724465.
+      nsCOMPtr<nsIURI> referer;
+      net::ReferrerPolicy referrerPolicy = net::RP_Default;
+
+      nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(element);
+      if (olc)
+        olc->GetSrcURI(getter_AddRefs(referer));
+
+
+      if (!referer) {
+        if (!doc) {
+          return NS_ERROR_FAILURE;
+        }
+        referer = doc->GetDocumentURI();
+        referrerPolicy = doc->GetReferrerPolicy();
+      }
+
+      rv = httpChannel->SetReferrerWithPolicy(referer, referrerPolicy);
+      NS_ENSURE_SUCCESS(rv,rv);
+    }
+
+    if (aPostStream) {
+      // XXX it's a bit of a hack to rewind the postdata stream
+      // here but it has to be done in case the post data is
+      // being reused multiple times.
+      nsCOMPtr<nsISeekableStream>
+      postDataSeekable(do_QueryInterface(aPostStream));
+      if (postDataSeekable)
+        postDataSeekable->Seek(nsISeekableStream::NS_SEEK_SET, 0);
+
+      nsCOMPtr<nsIUploadChannel> uploadChannel(do_QueryInterface(httpChannel));
+      NS_ASSERTION(uploadChannel, "http must support nsIUploadChannel");
+
+      uploadChannel->SetUploadStream(aPostStream, EmptyCString(), -1);
+    }
+
+    if (aHeadersData) {
+      rv = AddHeadersToChannel(aHeadersData, aHeadersDataLen, httpChannel);
+      NS_ENSURE_SUCCESS(rv,rv);
+    }
+  }
+  rv = channel->AsyncOpen2(listenerPeer);
+  if (NS_SUCCEEDED(rv))
+    listenerPeer->TrackRequest(channel);
+  return rv;
+}
+
+nsresult
+nsPluginHost::AddHeadersToChannel(const char *aHeadersData,
+                                  uint32_t aHeadersDataLen,
+                                  nsIChannel *aGenericChannel)
+{
+  nsresult rv = NS_OK;
+
+  nsCOMPtr<nsIHttpChannel> aChannel = do_QueryInterface(aGenericChannel);
+  if (!aChannel) {
+    return NS_ERROR_NULL_POINTER;
+  }
+
+  // used during the manipulation of the String from the aHeadersData
+  nsAutoCString headersString;
+  nsAutoCString oneHeader;
+  nsAutoCString headerName;
+  nsAutoCString headerValue;
+  int32_t crlf = 0;
+  int32_t colon = 0;
+
+  // Turn the char * buffer into an nsString.
+  headersString = aHeadersData;
+
+  // Iterate over the nsString: for each "\r\n" delimited chunk,
+  // add the value as a header to the nsIHTTPChannel
+  while (true) {
+    crlf = headersString.Find("\r\n", true);
+    if (-1 == crlf) {
+      rv = NS_OK;
+      return rv;
+    }
+    headersString.Mid(oneHeader, 0, crlf);
+    headersString.Cut(0, crlf + 2);
+    oneHeader.StripWhitespace();
+    colon = oneHeader.Find(":");
+    if (-1 == colon) {
+      rv = NS_ERROR_NULL_POINTER;
+      return rv;
+    }
+    oneHeader.Left(headerName, colon);
+    colon++;
+    oneHeader.Mid(headerValue, colon, oneHeader.Length() - colon);
+
+    // FINALLY: we can set the header!
+
+    rv = aChannel->SetRequestHeader(headerName, headerValue, true);
+    if (NS_FAILED(rv)) {
+      rv = NS_ERROR_NULL_POINTER;
+      return rv;
+    }
+  }
+}
+
+nsresult
+nsPluginHost::StopPluginInstance(nsNPAPIPluginInstance* aInstance)
+{
+  PROFILER_LABEL_FUNC(js::ProfileEntry::Category::OTHER);
+  if (PluginDestructionGuard::DelayDestroy(aInstance)) {
+    return NS_OK;
+  }
+
+  PLUGIN_LOG(PLUGIN_LOG_NORMAL,
+  ("nsPluginHost::StopPluginInstance called instance=%p\n",aInstance));
+
+  if (aInstance->HasStartedDestroying()) {
+    return NS_OK;
+  }
+
+  Telemetry::AutoTimer<Telemetry::PLUGIN_SHUTDOWN_MS> timer;
+  aInstance->Stop();
+
+  // if the instance does not want to be 'cached' just remove it
+  bool doCache = aInstance->ShouldCache();
+  if (doCache) {
+    // try to get the max cached instances from a pref or use default
+    uint32_t cachedInstanceLimit =
+      Preferences::GetUint(NS_PREF_MAX_NUM_CACHED_INSTANCES,
+                           DEFAULT_NUMBER_OF_STOPPED_INSTANCES);
+    if (StoppedInstanceCount() >= cachedInstanceLimit) {
+      nsNPAPIPluginInstance *oldestInstance = FindOldestStoppedInstance();
+      if (oldestInstance) {
+        nsPluginTag* pluginTag = TagForPlugin(oldestInstance->GetPlugin());
+        oldestInstance->Destroy();
+        mInstances.RemoveElement(oldestInstance);
+        // TODO: Remove this check once bug 752422 was investigated
+        if (pluginTag) {
+          OnPluginInstanceDestroyed(pluginTag);
+        }
+      }
+    }
+  } else {
+    nsPluginTag* pluginTag = TagForPlugin(aInstance->GetPlugin());
+    aInstance->Destroy();
+    mInstances.RemoveElement(aInstance);
+    // TODO: Remove this check once bug 752422 was investigated
+    if (pluginTag) {
+      OnPluginInstanceDestroyed(pluginTag);
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult nsPluginHost::NewPluginStreamListener(nsIURI* aURI,
+                                               nsNPAPIPluginInstance* aInstance,
+                                               nsIStreamListener **aStreamListener)
+{
+  NS_ENSURE_ARG_POINTER(aURI);
+  NS_ENSURE_ARG_POINTER(aStreamListener);
+
+  RefPtr<nsPluginStreamListenerPeer> listener = new nsPluginStreamListenerPeer();
+  nsresult rv = listener->Initialize(aURI, aInstance, nullptr);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  listener.forget(aStreamListener);
+
+  return NS_OK;
+}
+
+void nsPluginHost::CreateWidget(nsPluginInstanceOwner* aOwner)
+{
+  aOwner->CreateWidget();
+
+  // If we've got a native window, the let the plugin know about it.
+  aOwner->CallSetWindow();
+}
+
+NS_IMETHODIMP nsPluginHost::Observe(nsISupports *aSubject,
+                                    const char *aTopic,
+                                    const char16_t *someData)
+{
+  if (!strcmp(NS_XPCOM_SHUTDOWN_OBSERVER_ID, aTopic)) {
+    OnShutdown();
+    UnloadPlugins();
+    sInst->Release();
+  }
+  if (!strcmp(NS_PREFBRANCH_PREFCHANGE_TOPIC_ID, aTopic)) {
+    mPluginsDisabled = Preferences::GetBool("plugin.disable", false);
+    // Unload or load plugins as needed
+    if (mPluginsDisabled) {
+      UnloadPlugins();
+    } else {
+      LoadPlugins();
+    }
+  }
+  if (!strcmp("blocklist-updated", aTopic)) {
+    nsPluginTag* plugin = mPlugins;
+    while (plugin) {
+      plugin->InvalidateBlocklistState();
+      plugin = plugin->mNext;
+    }
+  }
+#ifdef MOZ_WIDGET_ANDROID
+  if (!strcmp("application-background", aTopic)) {
+    for(uint32_t i = 0; i < mInstances.Length(); i++) {
+      mInstances[i]->NotifyForeground(false);
+    }
+  }
+  if (!strcmp("application-foreground", aTopic)) {
+    for(uint32_t i = 0; i < mInstances.Length(); i++) {
+      if (mInstances[i]->IsOnScreen())
+        mInstances[i]->NotifyForeground(true);
+    }
+  }
+  if (!strcmp("memory-pressure", aTopic)) {
+    for(uint32_t i = 0; i < mInstances.Length(); i++) {
+      mInstances[i]->MemoryPressure();
+    }
+  }
+#endif
+  return NS_OK;
+}
+
+nsresult
+nsPluginHost::ParsePostBufferToFixHeaders(const char *inPostData, uint32_t inPostDataLen,
+                                          char **outPostData, uint32_t *outPostDataLen)
+{
+  if (!inPostData || !outPostData || !outPostDataLen)
+    return NS_ERROR_NULL_POINTER;
+
+  *outPostData = 0;
+  *outPostDataLen = 0;
+
+  const char CR = '\r';
+  const char LF = '\n';
+  const char CRLFCRLF[] = {CR,LF,CR,LF,'\0'}; // C string"\r\n\r\n"
+  const char ContentLenHeader[] = "Content-length";
+
+  AutoTArray<const char*, 8> singleLF;
+  const char *pSCntlh = 0;// pointer to start of ContentLenHeader in inPostData
+  const char *pSod = 0;   // pointer to start of data in inPostData
+  const char *pEoh = 0;   // pointer to end of headers in inPostData
+  const char *pEod = inPostData + inPostDataLen; // pointer to end of inPostData
+  if (*inPostData == LF) {
+    // If no custom headers are required, simply add a blank
+    // line ('\n') to the beginning of the file or buffer.
+    // so *inPostData == '\n' is valid
+    pSod = inPostData + 1;
+  } else {
+    const char *s = inPostData; //tmp pointer to sourse inPostData
+    while (s < pEod) {
+      if (!pSCntlh &&
+          (*s == 'C' || *s == 'c') &&
+          (s + sizeof(ContentLenHeader) - 1 < pEod) &&
+          (!PL_strncasecmp(s, ContentLenHeader, sizeof(ContentLenHeader) - 1)))
+      {
+        // lets assume this is ContentLenHeader for now
+        const char *p = pSCntlh = s;
+        p += sizeof(ContentLenHeader) - 1;
+        // search for first CR or LF == end of ContentLenHeader
+        for (; p < pEod; p++) {
+          if (*p == CR || *p == LF) {
+            // got delimiter,
+            // one more check; if previous char is a digit
+            // most likely pSCntlh points to the start of ContentLenHeader
+            if (*(p-1) >= '0' && *(p-1) <= '9') {
+              s = p;
+            }
+            break; //for loop
+          }
+        }
+        if (pSCntlh == s) { // curret ptr is the same
+          pSCntlh = 0; // that was not ContentLenHeader
+          break; // there is nothing to parse, break *WHILE LOOP* here
+        }
+      }
+
+      if (*s == CR) {
+        if (pSCntlh && // only if ContentLenHeader is found we are looking for end of headers
+            ((s + sizeof(CRLFCRLF)-1) <= pEod) &&
+            !memcmp(s, CRLFCRLF, sizeof(CRLFCRLF)-1))
+        {
+          s += sizeof(CRLFCRLF)-1;
+          pEoh = pSod = s; // data stars here
+          break;
+        }
+      } else if (*s == LF) {
+        if (*(s-1) != CR) {
+          singleLF.AppendElement(s);
+        }
+        if (pSCntlh && (s+1 < pEod) && (*(s+1) == LF)) {
+          s++;
+          singleLF.AppendElement(s);
+          s++;
+          pEoh = pSod = s; // data stars here
+          break;
+        }
+      }
+      s++;
+    }
+  }
+
+  // deal with output buffer
+  if (!pSod) { // lets assume whole buffer is a data
+    pSod = inPostData;
+  }
+
+  uint32_t newBufferLen = 0;
+  uint32_t dataLen = pEod - pSod;
+  uint32_t headersLen = pEoh ? pSod - inPostData : 0;
+
+  char *p; // tmp ptr into new output buf
+  if (headersLen) { // we got a headers
+    // this function does not make any assumption on correctness
+    // of ContentLenHeader value in this case.
+
+    newBufferLen = dataLen + headersLen;
+    // in case there were single LFs in headers
+    // reserve an extra space for CR will be added before each single LF
+    int cntSingleLF = singleLF.Length();
+    newBufferLen += cntSingleLF;
+
+    if (!(*outPostData = p = (char*)moz_xmalloc(newBufferLen)))
+      return NS_ERROR_OUT_OF_MEMORY;
+
+    // deal with single LF
+    const char *s = inPostData;
+    if (cntSingleLF) {
+      for (int i=0; i<cntSingleLF; i++) {
+        const char *plf = singleLF.ElementAt(i); // ptr to single LF in headers
+        int n = plf - s; // bytes to copy
+        if (n) { // for '\n\n' there is nothing to memcpy
+          memcpy(p, s, n);
+          p += n;
+        }
+        *p++ = CR;
+        s = plf;
+        *p++ = *s++;
+      }
+    }
+    // are we done with headers?
+    headersLen = pEoh - s;
+    if (headersLen) { // not yet
+      memcpy(p, s, headersLen); // copy the rest
+      p += headersLen;
+    }
+  } else  if (dataLen) { // no ContentLenHeader is found but there is a data
+    // make new output buffer big enough
+    // to keep ContentLenHeader+value followed by data
+    uint32_t l = sizeof(ContentLenHeader) + sizeof(CRLFCRLF) + 32;
+    newBufferLen = dataLen + l;
+    if (!(*outPostData = p = (char*)moz_xmalloc(newBufferLen)))
+      return NS_ERROR_OUT_OF_MEMORY;
+    headersLen = snprintf(p, l,"%s: %u%s", ContentLenHeader, dataLen, CRLFCRLF);
+    if (headersLen == l) { // if snprintf has ate all extra space consider this as an error
+      free(p);
+      *outPostData = 0;
+      return NS_ERROR_FAILURE;
+    }
+    p += headersLen;
+    newBufferLen = headersLen + dataLen;
+  }
+  // at this point we've done with headers.
+  // there is a possibility that input buffer has only headers info in it
+  // which already parsed and copied into output buffer.
+  // copy the data
+  if (dataLen) {
+    memcpy(p, pSod, dataLen);
+  }
+
+  *outPostDataLen = newBufferLen;
+
+  return NS_OK;
+}
+
+nsresult
+nsPluginHost::CreateTempFileToPost(const char *aPostDataURL, nsIFile **aTmpFile)
+{
+  nsresult rv;
+  int64_t fileSize;
+  nsAutoCString filename;
+
+  // stat file == get size & convert file:///c:/ to c: if needed
+  nsCOMPtr<nsIFile> inFile;
+  rv = NS_GetFileFromURLSpec(nsDependentCString(aPostDataURL),
+                             getter_AddRefs(inFile));
+  if (NS_FAILED(rv)) {
+    nsCOMPtr<nsIFile> localFile;
+    rv = NS_NewNativeLocalFile(nsDependentCString(aPostDataURL), false,
+                               getter_AddRefs(localFile));
+    if (NS_FAILED(rv)) return rv;
+    inFile = localFile;
+  }
+  rv = inFile->GetFileSize(&fileSize);
+  if (NS_FAILED(rv)) return rv;
+  rv = inFile->GetNativePath(filename);
+  if (NS_FAILED(rv)) return rv;
+
+  if (fileSize != 0) {
+    nsCOMPtr<nsIInputStream> inStream;
+    rv = NS_NewLocalFileInputStream(getter_AddRefs(inStream), inFile);
+    if (NS_FAILED(rv)) return rv;
+
+    // Create a temporary file to write the http Content-length:
+    // %ld\r\n\" header and "\r\n" == end of headers for post data to
+
+    nsCOMPtr<nsIFile> tempFile;
+    rv = GetPluginTempDir(getter_AddRefs(tempFile));
+    if (NS_FAILED(rv))
+      return rv;
+
+    nsAutoCString inFileName;
+    inFile->GetNativeLeafName(inFileName);
+    // XXX hack around bug 70083
+    inFileName.Insert(NS_LITERAL_CSTRING("post-"), 0);
+    rv = tempFile->AppendNative(inFileName);
+
+    if (NS_FAILED(rv))
+      return rv;
+
+    // make it unique, and mode == 0600, not world-readable
+    rv = tempFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
+    if (NS_FAILED(rv))
+      return rv;
+
+    nsCOMPtr<nsIOutputStream> outStream;
+    if (NS_SUCCEEDED(rv)) {
+      rv = NS_NewLocalFileOutputStream(getter_AddRefs(outStream),
+        tempFile,
+        (PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE),
+        0600); // 600 so others can't read our form data
+    }
+    NS_ASSERTION(NS_SUCCEEDED(rv), "Post data file couldn't be created!");
+    if (NS_FAILED(rv))
+      return rv;
+
+    char buf[1024];
+    uint32_t br, bw;
+    bool firstRead = true;
+    while (1) {
+      // Read() mallocs if buffer is null
+      rv = inStream->Read(buf, 1024, &br);
+      if (NS_FAILED(rv) || (int32_t)br <= 0)
+        break;
+      if (firstRead) {
+        //"For protocols in which the headers must be distinguished from the body,
+        // such as HTTP, the buffer or file should contain the headers, followed by
+        // a blank line, then the body. If no custom headers are required, simply
+        // add a blank line ('\n') to the beginning of the file or buffer.
+
+        char *parsedBuf;
+        // assuming first 1K (or what we got) has all headers in,
+        // lets parse it through nsPluginHost::ParsePostBufferToFixHeaders()
+        ParsePostBufferToFixHeaders((const char *)buf, br, &parsedBuf, &bw);
+        rv = outStream->Write(parsedBuf, bw, &br);
+        free(parsedBuf);
+        if (NS_FAILED(rv) || (bw != br))
+          break;
+
+        firstRead = false;
+        continue;
+      }
+      bw = br;
+      rv = outStream->Write(buf, bw, &br);
+      if (NS_FAILED(rv) || (bw != br))
+        break;
+    }
+
+    inStream->Close();
+    outStream->Close();
+    if (NS_SUCCEEDED(rv))
+      tempFile.forget(aTmpFile);
+  }
+  return rv;
+}
+
+nsresult
+nsPluginHost::NewPluginNativeWindow(nsPluginNativeWindow ** aPluginNativeWindow)
+{
+  return PLUG_NewPluginNativeWindow(aPluginNativeWindow);
+}
+
+nsresult
+nsPluginHost::GetPluginName(nsNPAPIPluginInstance *aPluginInstance,
+                            const char** aPluginName)
+{
+  nsNPAPIPluginInstance *instance = static_cast<nsNPAPIPluginInstance*>(aPluginInstance);
+  if (!instance)
+    return NS_ERROR_FAILURE;
+
+  nsNPAPIPlugin* plugin = instance->GetPlugin();
+  if (!plugin)
+    return NS_ERROR_FAILURE;
+
+  *aPluginName = TagForPlugin(plugin)->Name().get();
+
+  return NS_OK;
+}
+
+nsresult
+nsPluginHost::GetPluginTagForInstance(nsNPAPIPluginInstance *aPluginInstance,
+                                      nsIPluginTag **aPluginTag)
+{
+  NS_ENSURE_ARG_POINTER(aPluginInstance);
+  NS_ENSURE_ARG_POINTER(aPluginTag);
+
+  nsNPAPIPlugin *plugin = aPluginInstance->GetPlugin();
+  if (!plugin)
+    return NS_ERROR_FAILURE;
+
+  *aPluginTag = TagForPlugin(plugin);
+
+  NS_ADDREF(*aPluginTag);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPluginHost::Notify(nsITimer* timer)
+{
+  RefPtr<nsPluginTag> pluginTag = mPlugins;
+  while (pluginTag) {
+    if (pluginTag->mUnloadTimer == timer) {
+      if (!IsRunningPlugin(pluginTag)) {
+        pluginTag->TryUnloadPlugin(false);
+      }
+      return NS_OK;
+    }
+    pluginTag = pluginTag->mNext;
+  }
+
+  return NS_ERROR_FAILURE;
+}
+
+#ifdef XP_WIN
+// Re-enable any top level browser windows that were disabled by modal dialogs
+// displayed by the crashed plugin.
+static void
+CheckForDisabledWindows()
+{
+  nsCOMPtr<nsIWindowMediator> wm(do_GetService(NS_WINDOWMEDIATOR_CONTRACTID));
+  if (!wm)
+    return;
+
+  nsCOMPtr<nsISimpleEnumerator> windowList;
+  wm->GetXULWindowEnumerator(nullptr, getter_AddRefs(windowList));
+  if (!windowList)
+    return;
+
+  bool haveWindows;
+  do {
+    windowList->HasMoreElements(&haveWindows);
+    if (!haveWindows)
+      return;
+
+    nsCOMPtr<nsISupports> supportsWindow;
+    windowList->GetNext(getter_AddRefs(supportsWindow));
+    nsCOMPtr<nsIBaseWindow> baseWin(do_QueryInterface(supportsWindow));
+    if (baseWin) {
+      nsCOMPtr<nsIWidget> widget;
+      baseWin->GetMainWidget(getter_AddRefs(widget));
+      if (widget && !widget->GetParent() &&
+          widget->IsVisible() &&
+          !widget->IsEnabled()) {
+        nsIWidget* child = widget->GetFirstChild();
+        bool enable = true;
+        while (child)  {
+          if (child->WindowType() == eWindowType_dialog) {
+            enable = false;
+            break;
+          }
+          child = child->GetNextSibling();
+        }
+        if (enable) {
+          widget->Enable(true);
+        }
+      }
+    }
+  } while (haveWindows);
+}
+#endif
+
+void
+nsPluginHost::PluginCrashed(nsNPAPIPlugin* aPlugin,
+                            const nsAString& pluginDumpID,
+                            const nsAString& browserDumpID)
+{
+  nsPluginTag* crashedPluginTag = TagForPlugin(aPlugin);
+  MOZ_ASSERT(crashedPluginTag);
+
+  // Notify the app's observer that a plugin crashed so it can submit
+  // a crashreport.
+  bool submittedCrashReport = false;
+  nsCOMPtr<nsIObserverService> obsService =
+    mozilla::services::GetObserverService();
+  nsCOMPtr<nsIWritablePropertyBag2> propbag =
+    do_CreateInstance("@mozilla.org/hash-property-bag;1");
+  if (obsService && propbag) {
+    uint32_t runID = 0;
+    PluginLibrary* library = aPlugin->GetLibrary();
+
+    if (!NS_WARN_IF(!library)) {
+      library->GetRunID(&runID);
+    }
+    propbag->SetPropertyAsUint32(NS_LITERAL_STRING("runID"), runID);
+
+    nsCString pluginName;
+    crashedPluginTag->GetName(pluginName);
+    propbag->SetPropertyAsAString(NS_LITERAL_STRING("pluginName"),
+                                   NS_ConvertUTF8toUTF16(pluginName));
+    propbag->SetPropertyAsAString(NS_LITERAL_STRING("pluginDumpID"),
+                                  pluginDumpID);
+    propbag->SetPropertyAsAString(NS_LITERAL_STRING("browserDumpID"),
+                                  browserDumpID);
+    propbag->SetPropertyAsBool(NS_LITERAL_STRING("submittedCrashReport"),
+                               submittedCrashReport);
+    obsService->NotifyObservers(propbag, "plugin-crashed", nullptr);
+    // see if an observer submitted a crash report.
+    propbag->GetPropertyAsBool(NS_LITERAL_STRING("submittedCrashReport"),
+                               &submittedCrashReport);
+  }
+
+  // Invalidate each nsPluginInstanceTag for the crashed plugin
+
+  for (uint32_t i = mInstances.Length(); i > 0; i--) {
+    nsNPAPIPluginInstance* instance = mInstances[i - 1];
+    if (instance->GetPlugin() == aPlugin) {
+      // notify the content node (nsIObjectLoadingContent) that the
+      // plugin has crashed
+      nsCOMPtr<nsIDOMElement> domElement;
+      instance->GetDOMElement(getter_AddRefs(domElement));
+      nsCOMPtr<nsIObjectLoadingContent> objectContent(do_QueryInterface(domElement));
+      if (objectContent) {
+        objectContent->PluginCrashed(crashedPluginTag, pluginDumpID, browserDumpID,
+                                     submittedCrashReport);
+      }
+
+      instance->Destroy();
+      mInstances.RemoveElement(instance);
+      OnPluginInstanceDestroyed(crashedPluginTag);
+    }
+  }
+
+  // Only after all instances have been invalidated is it safe to null
+  // out nsPluginTag.mPlugin. The next time we try to create an
+  // instance of this plugin we reload it (launch a new plugin process).
+
+  crashedPluginTag->mPlugin = nullptr;
+  crashedPluginTag->mContentProcessRunningCount = 0;
+
+#ifdef XP_WIN
+  CheckForDisabledWindows();
+#endif
+}
+
+nsNPAPIPluginInstance*
+nsPluginHost::FindInstance(const char *mimetype)
+{
+  for (uint32_t i = 0; i < mInstances.Length(); i++) {
+    nsNPAPIPluginInstance* instance = mInstances[i];
+
+    const char* mt;
+    nsresult rv = instance->GetMIMEType(&mt);
+    if (NS_FAILED(rv))
+      continue;
+
+    if (PL_strcasecmp(mt, mimetype) == 0)
+      return instance;
+  }
+
+  return nullptr;
+}
+
+nsNPAPIPluginInstance*
+nsPluginHost::FindOldestStoppedInstance()
+{
+  nsNPAPIPluginInstance *oldestInstance = nullptr;
+  TimeStamp oldestTime = TimeStamp::Now();
+  for (uint32_t i = 0; i < mInstances.Length(); i++) {
+    nsNPAPIPluginInstance *instance = mInstances[i];
+    if (instance->IsRunning())
+      continue;
+
+    TimeStamp time = instance->StopTime();
+    if (time < oldestTime) {
+      oldestTime = time;
+      oldestInstance = instance;
+    }
+  }
+
+  return oldestInstance;
+}
+
+uint32_t
+nsPluginHost::StoppedInstanceCount()
+{
+  uint32_t stoppedCount = 0;
+  for (uint32_t i = 0; i < mInstances.Length(); i++) {
+    nsNPAPIPluginInstance *instance = mInstances[i];
+    if (!instance->IsRunning())
+      stoppedCount++;
+  }
+  return stoppedCount;
+}
+
+nsTArray< RefPtr<nsNPAPIPluginInstance> >*
+nsPluginHost::InstanceArray()
+{
+  return &mInstances;
+}
+
+void
+nsPluginHost::DestroyRunningInstances(nsPluginTag* aPluginTag)
+{
+  for (int32_t i = mInstances.Length(); i > 0; i--) {
+    nsNPAPIPluginInstance *instance = mInstances[i - 1];
+    if (instance->IsRunning() && (!aPluginTag || aPluginTag == TagForPlugin(instance->GetPlugin()))) {
+      instance->SetWindow(nullptr);
+      instance->Stop();
+
+      // Get rid of all the instances without the possibility of caching.
+      nsPluginTag* pluginTag = TagForPlugin(instance->GetPlugin());
+      instance->SetWindow(nullptr);
+
+      nsCOMPtr<nsIDOMElement> domElement;
+      instance->GetDOMElement(getter_AddRefs(domElement));
+      nsCOMPtr<nsIObjectLoadingContent> objectContent =
+        do_QueryInterface(domElement);
+
+      instance->Destroy();
+
+      mInstances.RemoveElement(instance);
+      OnPluginInstanceDestroyed(pluginTag);
+
+      // Notify owning content that we destroyed its plugin out from under it
+      if (objectContent) {
+        objectContent->PluginDestroyed();
+      }
+    }
+  }
+}
+
+// Runnable that does an async destroy of a plugin.
+
+class nsPluginDestroyRunnable : public Runnable,
+                                public PRCList
+{
+public:
+  explicit nsPluginDestroyRunnable(nsNPAPIPluginInstance *aInstance)
+    : mInstance(aInstance)
+  {
+    PR_INIT_CLIST(this);
+    PR_APPEND_LINK(this, &sRunnableListHead);
+  }
+
+  virtual ~nsPluginDestroyRunnable()
+  {
+    PR_REMOVE_LINK(this);
+  }
+
+  NS_IMETHOD Run() override
+  {
+    RefPtr<nsNPAPIPluginInstance> instance;
+
+    // Null out mInstance to make sure this code in another runnable
+    // will do the right thing even if someone was holding on to this
+    // runnable longer than we expect.
+    instance.swap(mInstance);
+
+    if (PluginDestructionGuard::DelayDestroy(instance)) {
+      // It's still not safe to destroy the plugin, it's now up to the
+      // outermost guard on the stack to take care of the destruction.
+      return NS_OK;
+    }
+
+    nsPluginDestroyRunnable *r =
+      static_cast<nsPluginDestroyRunnable*>(PR_NEXT_LINK(&sRunnableListHead));
+
+    while (r != &sRunnableListHead) {
+      if (r != this && r->mInstance == instance) {
+        // There's another runnable scheduled to tear down
+        // instance. Let it do the job.
+        return NS_OK;
+      }
+      r = static_cast<nsPluginDestroyRunnable*>(PR_NEXT_LINK(r));
+    }
+
+    PLUGIN_LOG(PLUGIN_LOG_NORMAL,
+               ("Doing delayed destroy of instance %p\n", instance.get()));
+
+    RefPtr<nsPluginHost> host = nsPluginHost::GetInst();
+    if (host)
+      host->StopPluginInstance(instance);
+
+    PLUGIN_LOG(PLUGIN_LOG_NORMAL,
+               ("Done with delayed destroy of instance %p\n", instance.get()));
+
+    return NS_OK;
+  }
+
+protected:
+  RefPtr<nsNPAPIPluginInstance> mInstance;
+
+  static PRCList sRunnableListHead;
+};
+
+PRCList nsPluginDestroyRunnable::sRunnableListHead =
+  PR_INIT_STATIC_CLIST(&nsPluginDestroyRunnable::sRunnableListHead);
+
+PRCList PluginDestructionGuard::sListHead =
+  PR_INIT_STATIC_CLIST(&PluginDestructionGuard::sListHead);
+
+PluginDestructionGuard::PluginDestructionGuard(nsNPAPIPluginInstance *aInstance)
+  : mInstance(aInstance)
+{
+  Init();
+}
+
+PluginDestructionGuard::PluginDestructionGuard(PluginAsyncSurrogate *aSurrogate)
+  : mInstance(static_cast<nsNPAPIPluginInstance*>(aSurrogate->GetNPP()->ndata))
+{
+  InitAsync();
+}
+
+PluginDestructionGuard::PluginDestructionGuard(NPP npp)
+  : mInstance(npp ? static_cast<nsNPAPIPluginInstance*>(npp->ndata) : nullptr)
+{
+  Init();
+}
+
+PluginDestructionGuard::~PluginDestructionGuard()
+{
+  NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread");
+
+  PR_REMOVE_LINK(this);
+
+  if (mDelayedDestroy) {
+    // We've attempted to destroy the plugin instance we're holding on
+    // to while we were guarding it. Do the actual destroy now, off of
+    // a runnable.
+    RefPtr<nsPluginDestroyRunnable> evt =
+      new nsPluginDestroyRunnable(mInstance);
+
+    NS_DispatchToMainThread(evt);
+  }
+}
+
+// static
+bool
+PluginDestructionGuard::DelayDestroy(nsNPAPIPluginInstance *aInstance)
+{
+  NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread");
+  NS_ASSERTION(aInstance, "Uh, I need an instance!");
+
+  // Find the first guard on the stack and make it do a delayed
+  // destroy upon destruction.
+
+  PluginDestructionGuard *g =
+    static_cast<PluginDestructionGuard*>(PR_LIST_HEAD(&sListHead));
+
+  while (g != &sListHead) {
+    if (g->mInstance == aInstance) {
+      g->mDelayedDestroy = true;
+
+      return true;
+    }
+    g = static_cast<PluginDestructionGuard*>(PR_NEXT_LINK(g));
+  }
+
+  return false;
+}