diff --git a/modules/libpref/src/nsPrefBranch.cpp b/modules/libpref/src/nsPrefBranch.cpp
index a795273fb6c..6e241ee81e7 100644
--- a/modules/libpref/src/nsPrefBranch.cpp
+++ b/modules/libpref/src/nsPrefBranch.cpp
@@ -44,7 +44,6 @@
 #endif
 
 #include "nsPrefBranch.h"
-#include "nsPrefService.h"
 #include "nsILocalFile.h"
 #include "nsIObserverService.h"
 #include "nsXPCOM.h"
@@ -53,7 +52,6 @@
 #include "nsString.h"
 #include "nsReadableUtils.h"
 #include "nsXPIDLString.h"
-#include "nsThreadUtils.h"
 #include "nsIStringBundle.h"
 #include "prefapi.h"
 #include "prmem.h"
@@ -155,9 +153,6 @@ NS_INTERFACE_MAP_END
 NS_IMETHODIMP nsPrefBranch::GetRoot(char **aRoot)
 {
   NS_ENSURE_ARG_POINTER(aRoot);
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
 
   mPrefRoot.Truncate(mPrefRootLength);
   *aRoot = ToNewCString(mPrefRoot);
@@ -166,10 +161,6 @@ NS_IMETHODIMP nsPrefBranch::GetRoot(char **aRoot)
 
 NS_IMETHODIMP nsPrefBranch::GetPrefType(const char *aPrefName, PRInt32 *_retval)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (ContentChild* cpc = GetContentChild()) {
     nsresult rv = NS_ERROR_NOT_AVAILABLE;
@@ -188,10 +179,6 @@ NS_IMETHODIMP nsPrefBranch::GetPrefType(const char *aPrefName, PRInt32 *_retval)
 
 NS_IMETHODIMP nsPrefBranch::GetBoolPref(const char *aPrefName, PRBool *_retval)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (ContentChild* cpc = GetContentChild()) {
     nsresult rv = NS_ERROR_NOT_AVAILABLE;
@@ -209,10 +196,6 @@ NS_IMETHODIMP nsPrefBranch::GetBoolPref(const char *aPrefName, PRBool *_retval)
 
 NS_IMETHODIMP nsPrefBranch::SetBoolPref(const char *aPrefName, PRInt32 aValue)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (GetContentChild()) {
     NS_ERROR("cannot set pref from content process");
@@ -226,10 +209,6 @@ NS_IMETHODIMP nsPrefBranch::SetBoolPref(const char *aPrefName, PRInt32 aValue)
 
 NS_IMETHODIMP nsPrefBranch::GetCharPref(const char *aPrefName, char **_retval)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (ContentChild* cpc = GetContentChild()) {
     nsresult rv = NS_ERROR_NOT_AVAILABLE;
@@ -249,10 +228,6 @@ NS_IMETHODIMP nsPrefBranch::GetCharPref(const char *aPrefName, char **_retval)
 
 NS_IMETHODIMP nsPrefBranch::SetCharPref(const char *aPrefName, const char *aValue)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (GetContentChild()) {
     NS_ERROR("cannot set pref from content process");
@@ -266,10 +241,6 @@ NS_IMETHODIMP nsPrefBranch::SetCharPref(const char *aPrefName, const char *aValu
 
 NS_IMETHODIMP nsPrefBranch::GetIntPref(const char *aPrefName, PRInt32 *_retval)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (ContentChild* cpc = GetContentChild()) {
     nsresult rv = NS_ERROR_NOT_AVAILABLE;
@@ -287,10 +258,6 @@ NS_IMETHODIMP nsPrefBranch::GetIntPref(const char *aPrefName, PRInt32 *_retval)
 
 NS_IMETHODIMP nsPrefBranch::SetIntPref(const char *aPrefName, PRInt32 aValue)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (GetContentChild()) {
     NS_ERROR("cannot set pref from content process");
@@ -304,10 +271,6 @@ NS_IMETHODIMP nsPrefBranch::SetIntPref(const char *aPrefName, PRInt32 aValue)
 
 NS_IMETHODIMP nsPrefBranch::GetComplexValue(const char *aPrefName, const nsIID & aType, void **_retval)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
   nsresult       rv;
   nsXPIDLCString utf8String;
 
@@ -482,10 +445,6 @@ NS_IMETHODIMP nsPrefBranch::GetComplexValue(const char *aPrefName, const nsIID &
 
 NS_IMETHODIMP nsPrefBranch::SetComplexValue(const char *aPrefName, const nsIID & aType, nsISupports *aValue)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (GetContentChild()) {
     NS_ERROR("cannot set pref from content process");
@@ -575,10 +534,6 @@ NS_IMETHODIMP nsPrefBranch::SetComplexValue(const char *aPrefName, const nsIID &
 
 NS_IMETHODIMP nsPrefBranch::ClearUserPref(const char *aPrefName)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (GetContentChild()) {
     NS_ERROR("cannot set pref from content process");
@@ -593,9 +548,6 @@ NS_IMETHODIMP nsPrefBranch::ClearUserPref(const char *aPrefName)
 NS_IMETHODIMP nsPrefBranch::PrefHasUserValue(const char *aPrefName, PRBool *_retval)
 {
   NS_ENSURE_ARG_POINTER(_retval);
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
 
 #ifdef MOZ_IPC
   if (ContentChild* cpc = GetContentChild()) {
@@ -615,10 +567,6 @@ NS_IMETHODIMP nsPrefBranch::PrefHasUserValue(const char *aPrefName, PRBool *_ret
 
 NS_IMETHODIMP nsPrefBranch::LockPref(const char *aPrefName)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (GetContentChild()) {
     NS_ERROR("cannot lock pref from content process");
@@ -633,9 +581,6 @@ NS_IMETHODIMP nsPrefBranch::LockPref(const char *aPrefName)
 NS_IMETHODIMP nsPrefBranch::PrefIsLocked(const char *aPrefName, PRBool *_retval)
 {
   NS_ENSURE_ARG_POINTER(_retval);
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
 
 #ifdef MOZ_IPC
   if (ContentChild* cpc = GetContentChild()) {
@@ -655,10 +600,6 @@ NS_IMETHODIMP nsPrefBranch::PrefIsLocked(const char *aPrefName, PRBool *_retval)
 
 NS_IMETHODIMP nsPrefBranch::UnlockPref(const char *aPrefName)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (GetContentChild()) {
     NS_ERROR("cannot unlock pref from content process");
@@ -678,10 +619,6 @@ NS_IMETHODIMP nsPrefBranch::ResetBranch(const char *aStartingAt)
 
 NS_IMETHODIMP nsPrefBranch::DeleteBranch(const char *aStartingAt)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (GetContentChild()) {
     NS_ERROR("cannot set pref from content process");
@@ -695,10 +632,6 @@ NS_IMETHODIMP nsPrefBranch::DeleteBranch(const char *aStartingAt)
 
 NS_IMETHODIMP nsPrefBranch::GetChildList(const char *aStartingAt, PRUint32 *aCount, char ***aChildArray)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
   char            **outArray;
   PRInt32         numPrefs;
   PRInt32         dwIndex;
@@ -769,10 +702,6 @@ NS_IMETHODIMP nsPrefBranch::GetChildList(const char *aStartingAt, PRUint32 *aCou
 
 NS_IMETHODIMP nsPrefBranch::AddObserver(const char *aDomain, nsIObserver *aObserver, PRBool aHoldWeak)
 {
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
   PrefCallbackData *pCallback;
   const char *pref;
 
@@ -838,9 +767,6 @@ NS_IMETHODIMP nsPrefBranch::RemoveObserver(const char *aDomain, nsIObserver *aOb
 {
   NS_ENSURE_ARG_POINTER(aDomain);
   NS_ENSURE_ARG_POINTER(aObserver);
-  if (NS_UNLIKELY(!nsPrefService::CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
 
 #ifdef MOZ_IPC
   if (XRE_GetProcessType() == GeckoProcessType_Content) {
diff --git a/modules/libpref/src/nsPrefService.cpp b/modules/libpref/src/nsPrefService.cpp
index 6707adda9db..fde4e6325bd 100644
--- a/modules/libpref/src/nsPrefService.cpp
+++ b/modules/libpref/src/nsPrefService.cpp
@@ -45,7 +45,6 @@
 #include "nsAppDirectoryServiceDefs.h"
 #include "nsDirectoryServiceDefs.h"
 #include "nsICategoryManager.h"
-#include "nsIConsoleService.h"
 #include "nsCategoryManagerUtils.h"
 #include "nsNetUtil.h"
 #include "nsIFile.h"
@@ -57,7 +56,6 @@
 #include "nsCOMArray.h"
 #include "nsXPCOMCID.h"
 #include "nsAutoPtr.h"
-#include "nsThreadUtils.h"
 
 #include "nsQuickSort.h"
 #include "prmem.h"
@@ -201,10 +199,6 @@ NS_IMETHODIMP nsPrefService::Observe(nsISupports *aSubject, const char *aTopic,
 
 NS_IMETHODIMP nsPrefService::ReadUserPrefs(nsIFile *aFile)
 {
-  if (NS_UNLIKELY(!CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (XRE_GetProcessType() == GeckoProcessType_Content) {
     NS_ERROR("cannot load prefs from content process");
@@ -228,10 +222,6 @@ NS_IMETHODIMP nsPrefService::ReadUserPrefs(nsIFile *aFile)
 
 NS_IMETHODIMP nsPrefService::ResetPrefs()
 {
-  if (NS_UNLIKELY(!CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (XRE_GetProcessType() == GeckoProcessType_Content) {
     NS_ERROR("cannot set prefs from content process");
@@ -250,10 +240,6 @@ NS_IMETHODIMP nsPrefService::ResetPrefs()
 
 NS_IMETHODIMP nsPrefService::ResetUserPrefs()
 {
-  if (NS_UNLIKELY(!CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (XRE_GetProcessType() == GeckoProcessType_Content) {
     NS_ERROR("cannot set prefs from content process");
@@ -267,10 +253,6 @@ NS_IMETHODIMP nsPrefService::ResetUserPrefs()
 
 NS_IMETHODIMP nsPrefService::SavePrefFile(nsIFile *aFile)
 {
-  if (NS_UNLIKELY(!CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
 #ifdef MOZ_IPC
   if (XRE_GetProcessType() == GeckoProcessType_Content) {
     NS_ERROR("cannot save prefs from content process");
@@ -283,10 +265,6 @@ NS_IMETHODIMP nsPrefService::SavePrefFile(nsIFile *aFile)
 
 NS_IMETHODIMP nsPrefService::GetBranch(const char *aPrefRoot, nsIPrefBranch **_retval)
 {
-  if (NS_UNLIKELY(!CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
   nsresult rv;
 
   if ((nsnull != aPrefRoot) && (*aPrefRoot != '\0')) {
@@ -305,10 +283,6 @@ NS_IMETHODIMP nsPrefService::GetBranch(const char *aPrefRoot, nsIPrefBranch **_r
 
 NS_IMETHODIMP nsPrefService::GetDefaultBranch(const char *aPrefRoot, nsIPrefBranch **_retval)
 {
-  if (NS_UNLIKELY(!CheckAndLogBackgroundThreadUse())) {
-    return NS_ERROR_UNEXPECTED;
-  }
-
   nsresult rv;
 
   // TODO: - cache this stuff and allow consumers to share branches (hold weak references I think)
@@ -828,22 +802,3 @@ static nsresult pref_InitInitialObjects()
 
   return pref_LoadPrefsInDirList(NS_EXT_PREFS_DEFAULTS_DIR_LIST);
 }
-
-// static
-bool
-nsPrefService::CheckAndLogBackgroundThreadUse()
-{
-  if (NS_IsMainThread()) {
-    return true;
-  }
-
-  NS_ERROR("Cannot be used on a background thread!");
-  nsCOMPtr<nsIConsoleService> cs =
-    do_GetService("@mozilla.org/consoleservice;1");
-  if (cs) {
-    (void)cs->LogStringMessage(NS_LITERAL_STRING(
-      "Invalid use of the preferences on a background thread!"
-    ).get());
-  }
-  return false;
-}
diff --git a/modules/libpref/src/nsPrefService.h b/modules/libpref/src/nsPrefService.h
index 8c162a6e077..2ed87c8dd59 100644
--- a/modules/libpref/src/nsPrefService.h
+++ b/modules/libpref/src/nsPrefService.h
@@ -65,13 +65,7 @@ public:
   virtual ~nsPrefService();
 
   nsresult Init();
-
-  /**
-   * Checks to make sure we are on the main thread and log if we are not.
-   *
-   * @returns true if on the main thread, and false otherwise.
-   */
-  static bool CheckAndLogBackgroundThreadUse();
+                           
 protected:
   nsresult NotifyServiceObservers(const char *aSubject);
   nsresult UseDefaultPrefFile();