diff --git a/toolkit/components/aboutmemory/content/aboutMemory.js b/toolkit/components/aboutmemory/content/aboutMemory.js
index 432004f351a6..6eb1c32f8a96 100644
--- a/toolkit/components/aboutmemory/content/aboutMemory.js
+++ b/toolkit/components/aboutmemory/content/aboutMemory.js
@@ -335,7 +335,8 @@ function onLoad()
     appendElementWithText(row2, "div", "opsRowLabel", "Save memory reports");
   appendButton(row2, SvDesc, saveReportsToFile, "Measure and save" + kEllipsis);
 
-  // XXX njn: still not happy with the placement of this checkbox
+  // XXX: this isn't a great place for this checkbox, but I can't think of
+  // anywhere better.
   let label2 = appendElementWithText(labelDiv2, "label", "");
   gAnonymize = appendElement(label2, "input", "");
   gAnonymize.type = "checkbox";
diff --git a/xpcom/ds/nsAtomTable.cpp b/xpcom/ds/nsAtomTable.cpp
index 421f30d58b41..dcd20e6917cd 100644
--- a/xpcom/ds/nsAtomTable.cpp
+++ b/xpcom/ds/nsAtomTable.cpp
@@ -57,7 +57,6 @@ public:
 
   bool KeyEquals(KeyTypePointer aKey) const
   {
-    // njn: this is a heavyweight way to compare two char16ptr_t values!
     return mAtom->Equals(*aKey);
   }