diff --git a/accessible/base/AccGroupInfo.cpp b/accessible/base/AccGroupInfo.cpp
index bef707887002..8c7e8872631b 100644
--- a/accessible/base/AccGroupInfo.cpp
+++ b/accessible/base/AccGroupInfo.cpp
@@ -144,7 +144,7 @@ AccGroupInfo::Update()
 }
 
 Accessible*
-AccGroupInfo::FirstItemOf(Accessible* aContainer)
+AccGroupInfo::FirstItemOf(const Accessible* aContainer)
 {
   // ARIA tree can be arranged by ARIA groups case #1 (previous sibling of a
   // group is a parent) or by aria-level.
diff --git a/accessible/base/AccGroupInfo.h b/accessible/base/AccGroupInfo.h
index 093258070983..a0a9e4d8e452 100644
--- a/accessible/base/AccGroupInfo.h
+++ b/accessible/base/AccGroupInfo.h
@@ -67,7 +67,7 @@ public:
   /**
    * Return a first item for the given container.
    */
-  static Accessible* FirstItemOf(Accessible* aContainer);
+  static Accessible* FirstItemOf(const Accessible* aContainer);
 
   /**
    * Return next item of the same group to the given item.
diff --git a/accessible/generic/Accessible-inl.h b/accessible/generic/Accessible-inl.h
index 4b59b608b99b..a80ee3160a4f 100644
--- a/accessible/generic/Accessible-inl.h
+++ b/accessible/generic/Accessible-inl.h
@@ -19,7 +19,7 @@ namespace mozilla {
 namespace a11y {
 
 inline mozilla::a11y::role
-Accessible::Role()
+Accessible::Role() const
 {
   const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
   if (!roleMapEntry || roleMapEntry->roleRule != kUseMapRole)
diff --git a/accessible/generic/Accessible.cpp b/accessible/generic/Accessible.cpp
index 7a12528b4c30..d2ecee7f0643 100644
--- a/accessible/generic/Accessible.cpp
+++ b/accessible/generic/Accessible.cpp
@@ -1445,7 +1445,7 @@ Accessible::SetCurValue(double aValue)
 }
 
 role
-Accessible::ARIATransformRole(role aRole)
+Accessible::ARIATransformRole(role aRole) const
 {
   // Beginning with ARIA 1.1, user agents are expected to use the native host
   // language role of the element when the region role is used without a name.
diff --git a/accessible/generic/Accessible.h b/accessible/generic/Accessible.h
index adbdc122f907..0c7df72b2150 100644
--- a/accessible/generic/Accessible.h
+++ b/accessible/generic/Accessible.h
@@ -222,7 +222,7 @@ public:
   /**
    * Return enumerated accessible role (see constants in Role.h).
    */
-  mozilla::a11y::role Role();
+  mozilla::a11y::role Role() const;
 
   /**
    * Return true if ARIA role is specified on the element.
@@ -1062,7 +1062,7 @@ protected:
   /**
    * Return ARIA role (helper method).
    */
-  mozilla::a11y::role ARIATransformRole(mozilla::a11y::role aRole);
+  mozilla::a11y::role ARIATransformRole(mozilla::a11y::role aRole) const;
 
   //////////////////////////////////////////////////////////////////////////////
   // Name helpers