diff --git a/mozilla/layout/generic/nsFrame.cpp b/mozilla/layout/generic/nsFrame.cpp
index dc097d0763a..bbe404c0b08 100644
--- a/mozilla/layout/generic/nsFrame.cpp
+++ b/mozilla/layout/generic/nsFrame.cpp
@@ -1857,6 +1857,21 @@ nsFrame::SetSelected(nsIPresContext* aPresContext, nsIDOMRange *aRange,PRBool aS
 {
   if (aSelected && ParentDisablesSelection())
     return NS_OK;
+	// check whether style allows selection
+	const nsStyleUserInterface* userinterface;
+	GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
+	if (userinterface) {
+		if (userinterface->mUserSelect == NS_STYLE_USER_SELECT_AUTO) {
+				// if 'user-select' isn't set for this frame, use the parent's
+				if (mParent) {
+					mParent->GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
+				}
+		}
+		if (userinterface->mUserSelect == NS_STYLE_USER_SELECT_NONE) {
+		  return NS_OK;//do not continue no selection for this frame.
+		}
+	}
+
 /*  nsresult rv;
 
   if (eSpreadDown == aSpread){
diff --git a/mozilla/layout/generic/nsTextFrame.cpp b/mozilla/layout/generic/nsTextFrame.cpp
index c4834a9e9e9..c41100634f3 100644
--- a/mozilla/layout/generic/nsTextFrame.cpp
+++ b/mozilla/layout/generic/nsTextFrame.cpp
@@ -2098,6 +2098,21 @@ nsTextFrame::SetSelected(nsIPresContext* aPresContext,
     return NS_OK;
   }*/
 
+  // check whether style allows selection
+	const nsStyleUserInterface* userinterface;
+	GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
+	if (userinterface) {
+		if (userinterface->mUserSelect == NS_STYLE_USER_SELECT_AUTO) {
+				// if 'user-select' isn't set for this frame, use the parent's
+				if (mParent) {
+					mParent->GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
+				}
+		}
+		if (userinterface->mUserSelect == NS_STYLE_USER_SELECT_NONE) {
+		  return NS_OK;//do not continue no selection for this frame.
+		}
+	}
+
   PRBool found = PR_FALSE;
   PRBool wholeContentFound = PR_FALSE;//if the entire content we look at is selected.
   if (aRange) {
diff --git a/mozilla/layout/html/base/src/nsFrame.cpp b/mozilla/layout/html/base/src/nsFrame.cpp
index dc097d0763a..bbe404c0b08 100644
--- a/mozilla/layout/html/base/src/nsFrame.cpp
+++ b/mozilla/layout/html/base/src/nsFrame.cpp
@@ -1857,6 +1857,21 @@ nsFrame::SetSelected(nsIPresContext* aPresContext, nsIDOMRange *aRange,PRBool aS
 {
   if (aSelected && ParentDisablesSelection())
     return NS_OK;
+	// check whether style allows selection
+	const nsStyleUserInterface* userinterface;
+	GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
+	if (userinterface) {
+		if (userinterface->mUserSelect == NS_STYLE_USER_SELECT_AUTO) {
+				// if 'user-select' isn't set for this frame, use the parent's
+				if (mParent) {
+					mParent->GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
+				}
+		}
+		if (userinterface->mUserSelect == NS_STYLE_USER_SELECT_NONE) {
+		  return NS_OK;//do not continue no selection for this frame.
+		}
+	}
+
 /*  nsresult rv;
 
   if (eSpreadDown == aSpread){
diff --git a/mozilla/layout/html/base/src/nsTextFrame.cpp b/mozilla/layout/html/base/src/nsTextFrame.cpp
index c4834a9e9e9..c41100634f3 100644
--- a/mozilla/layout/html/base/src/nsTextFrame.cpp
+++ b/mozilla/layout/html/base/src/nsTextFrame.cpp
@@ -2098,6 +2098,21 @@ nsTextFrame::SetSelected(nsIPresContext* aPresContext,
     return NS_OK;
   }*/
 
+  // check whether style allows selection
+	const nsStyleUserInterface* userinterface;
+	GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
+	if (userinterface) {
+		if (userinterface->mUserSelect == NS_STYLE_USER_SELECT_AUTO) {
+				// if 'user-select' isn't set for this frame, use the parent's
+				if (mParent) {
+					mParent->GetStyleData(eStyleStruct_UserInterface, (const nsStyleStruct*&)userinterface);
+				}
+		}
+		if (userinterface->mUserSelect == NS_STYLE_USER_SELECT_NONE) {
+		  return NS_OK;//do not continue no selection for this frame.
+		}
+	}
+
   PRBool found = PR_FALSE;
   PRBool wholeContentFound = PR_FALSE;//if the entire content we look at is selected.
   if (aRange) {