diff --git a/xpcom/base/MemoryInfoDumper.cpp b/xpcom/base/MemoryInfoDumper.cpp
index 2e8c148c57ee..fb34b08a717c 100644
--- a/xpcom/base/MemoryInfoDumper.cpp
+++ b/xpcom/base/MemoryInfoDumper.cpp
@@ -399,7 +399,8 @@ DumpReport(nsIGZFileWriter *aWriter, bool aIsFirst,
 
   DUMP(aWriter, "\", \"path\": \"");
   nsCString path(aPath);
-  path.ReplaceSubstring("\\", "\\\\");    // escape backslashes for JSON
+  path.ReplaceSubstring("\\", "\\\\");    /* <backslash> --> \\ */
+  path.ReplaceSubstring("\"", "\\\"");    // " --> \"
   DUMP(aWriter, path);
 
   DUMP(aWriter, "\", \"kind\": ");