--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -2531,17 +2531,25 @@ void HTMLMediaElement::DoneCreatingEleme
 bool HTMLMediaElement::IsHTMLFocusable(bool aWithMouse,
                                        bool* aIsFocusable,
                                        int32_t* aTabIndex)
 {
   if (nsGenericHTMLElement::IsHTMLFocusable(aWithMouse, aIsFocusable, aTabIndex)) {
     return true;
   }
 
+
+#ifdef XP_MACOSX
+  // NB: this deliberately does not check
+  // nsFocusManager::sMouseFocusesFormControl as this is not a form control.
+  *aIsFocusable = !aWithMouse;
+#else
   *aIsFocusable = true;
+#endif
+
   return false;
 }
 
 int32_t HTMLMediaElement::TabIndexDefault()
 {
   return 0;
 }