diff --git a/mozilla/base/src/nsString.cpp b/mozilla/base/src/nsString.cpp
index fc7aac58e72..fcd8f1e8946 100644
--- a/mozilla/base/src/nsString.cpp
+++ b/mozilla/base/src/nsString.cpp
@@ -944,7 +944,7 @@ PRInt32 nsString::Right(nsString& aCopy,PRInt32 aCount) const {
  *  @param  aCount -- number of chars to be copied from aCopy
  *  @return number of chars inserted into this.
  */
-PRInt32 nsString::Insert(nsString& aCopy,PRInt32 anOffset,PRInt32 aCount) {
+PRInt32 nsString::Insert(const nsString& aCopy,PRInt32 anOffset,PRInt32 aCount) {
   aCount=(aCount>aCopy.mLength) ? aCopy.mLength : aCount; //don't try to copy more than you are given
   if (aCount < 0) aCount = aCopy.mLength;
   if(0<=anOffset) {
diff --git a/mozilla/base/src/nsString.h b/mozilla/base/src/nsString.h
index f97450a72e6..8470857e5ca 100644
--- a/mozilla/base/src/nsString.h
+++ b/mozilla/base/src/nsString.h
@@ -462,7 +462,7 @@ PRInt32 Right(nsString& aCopy,PRInt32 aCount) const;
  *  @param  aCount -- number of chars to be copied from aCopy
  *  @return number of chars inserted into this.
  */
-PRInt32 Insert(nsString& aCopy,PRInt32 anOffset,PRInt32 aCount=-1);
+PRInt32 Insert(const nsString& aCopy,PRInt32 anOffset,PRInt32 aCount=-1);
 
 /**
  * Insert a single unicode char into this string at
diff --git a/mozilla/string/obsolete/nsString.cpp b/mozilla/string/obsolete/nsString.cpp
index fc7aac58e72..fcd8f1e8946 100644
--- a/mozilla/string/obsolete/nsString.cpp
+++ b/mozilla/string/obsolete/nsString.cpp
@@ -944,7 +944,7 @@ PRInt32 nsString::Right(nsString& aCopy,PRInt32 aCount) const {
  *  @param  aCount -- number of chars to be copied from aCopy
  *  @return number of chars inserted into this.
  */
-PRInt32 nsString::Insert(nsString& aCopy,PRInt32 anOffset,PRInt32 aCount) {
+PRInt32 nsString::Insert(const nsString& aCopy,PRInt32 anOffset,PRInt32 aCount) {
   aCount=(aCount>aCopy.mLength) ? aCopy.mLength : aCount; //don't try to copy more than you are given
   if (aCount < 0) aCount = aCopy.mLength;
   if(0<=anOffset) {
diff --git a/mozilla/string/obsolete/nsString.h b/mozilla/string/obsolete/nsString.h
index f97450a72e6..8470857e5ca 100644
--- a/mozilla/string/obsolete/nsString.h
+++ b/mozilla/string/obsolete/nsString.h
@@ -462,7 +462,7 @@ PRInt32 Right(nsString& aCopy,PRInt32 aCount) const;
  *  @param  aCount -- number of chars to be copied from aCopy
  *  @return number of chars inserted into this.
  */
-PRInt32 Insert(nsString& aCopy,PRInt32 anOffset,PRInt32 aCount=-1);
+PRInt32 Insert(const nsString& aCopy,PRInt32 anOffset,PRInt32 aCount=-1);
 
 /**
  * Insert a single unicode char into this string at
diff --git a/mozilla/xpcom/ds/nsString.cpp b/mozilla/xpcom/ds/nsString.cpp
index fc7aac58e72..fcd8f1e8946 100644
--- a/mozilla/xpcom/ds/nsString.cpp
+++ b/mozilla/xpcom/ds/nsString.cpp
@@ -944,7 +944,7 @@ PRInt32 nsString::Right(nsString& aCopy,PRInt32 aCount) const {
  *  @param  aCount -- number of chars to be copied from aCopy
  *  @return number of chars inserted into this.
  */
-PRInt32 nsString::Insert(nsString& aCopy,PRInt32 anOffset,PRInt32 aCount) {
+PRInt32 nsString::Insert(const nsString& aCopy,PRInt32 anOffset,PRInt32 aCount) {
   aCount=(aCount>aCopy.mLength) ? aCopy.mLength : aCount; //don't try to copy more than you are given
   if (aCount < 0) aCount = aCopy.mLength;
   if(0<=anOffset) {
diff --git a/mozilla/xpcom/ds/nsString.h b/mozilla/xpcom/ds/nsString.h
index f97450a72e6..8470857e5ca 100644
--- a/mozilla/xpcom/ds/nsString.h
+++ b/mozilla/xpcom/ds/nsString.h
@@ -462,7 +462,7 @@ PRInt32 Right(nsString& aCopy,PRInt32 aCount) const;
  *  @param  aCount -- number of chars to be copied from aCopy
  *  @return number of chars inserted into this.
  */
-PRInt32 Insert(nsString& aCopy,PRInt32 anOffset,PRInt32 aCount=-1);
+PRInt32 Insert(const nsString& aCopy,PRInt32 anOffset,PRInt32 aCount=-1);
 
 /**
  * Insert a single unicode char into this string at
diff --git a/mozilla/xpcom/string/obsolete/nsString.cpp b/mozilla/xpcom/string/obsolete/nsString.cpp
index fc7aac58e72..fcd8f1e8946 100644
--- a/mozilla/xpcom/string/obsolete/nsString.cpp
+++ b/mozilla/xpcom/string/obsolete/nsString.cpp
@@ -944,7 +944,7 @@ PRInt32 nsString::Right(nsString& aCopy,PRInt32 aCount) const {
  *  @param  aCount -- number of chars to be copied from aCopy
  *  @return number of chars inserted into this.
  */
-PRInt32 nsString::Insert(nsString& aCopy,PRInt32 anOffset,PRInt32 aCount) {
+PRInt32 nsString::Insert(const nsString& aCopy,PRInt32 anOffset,PRInt32 aCount) {
   aCount=(aCount>aCopy.mLength) ? aCopy.mLength : aCount; //don't try to copy more than you are given
   if (aCount < 0) aCount = aCopy.mLength;
   if(0<=anOffset) {
diff --git a/mozilla/xpcom/string/obsolete/nsString.h b/mozilla/xpcom/string/obsolete/nsString.h
index f97450a72e6..8470857e5ca 100644
--- a/mozilla/xpcom/string/obsolete/nsString.h
+++ b/mozilla/xpcom/string/obsolete/nsString.h
@@ -462,7 +462,7 @@ PRInt32 Right(nsString& aCopy,PRInt32 aCount) const;
  *  @param  aCount -- number of chars to be copied from aCopy
  *  @return number of chars inserted into this.
  */
-PRInt32 Insert(nsString& aCopy,PRInt32 anOffset,PRInt32 aCount=-1);
+PRInt32 Insert(const nsString& aCopy,PRInt32 anOffset,PRInt32 aCount=-1);
 
 /**
  * Insert a single unicode char into this string at