diff --git a/widget/src/cocoa/nsDragService.mm b/widget/src/cocoa/nsDragService.mm
index f51667bdddc..90b74510fb4 100644
--- a/widget/src/cocoa/nsDragService.mm
+++ b/widget/src/cocoa/nsDragService.mm
@@ -514,6 +514,11 @@ nsDragService::IsDataFlavorSupported(const char *aDataFlavor, PRBool *_retval)
     if (availableType && [availableType isEqualToString:NSFilenamesPboardType])
       *_retval = PR_TRUE;
   }
+  else if (dataFlavor.EqualsLiteral(kURLMime)) {
+    NSString* availableType = [globalDragPboard availableTypeFromArray:[NSArray arrayWithObject:kCorePboardType_url]];
+    if (availableType && [availableType isEqualToString:kCorePboardType_url])
+      *_retval = PR_TRUE;
+  }
   else if (dataFlavor.EqualsLiteral(kUnicodeMime)) {
     NSString* availableType = [globalDragPboard availableTypeFromArray:[NSArray arrayWithObject:NSStringPboardType]];
     if (availableType && [availableType isEqualToString:NSStringPboardType])