diff --git a/accessible/public/nsIAccessibleRole.idl b/accessible/public/nsIAccessibleRole.idl
index dc43574512c..54de2bb9eab 100755
--- a/accessible/public/nsIAccessibleRole.idl
+++ b/accessible/public/nsIAccessibleRole.idl
@@ -44,7 +44,7 @@
  * @note - When adding a new role, be sure to also add it to nsRoleMap.h for
  *         each platform.
  */
-[scriptable, uuid(31685b85-36a3-448c-99ed-b034a198e303)]
+[scriptable, uuid(8c0f68f8-164a-4078-a9ee-36a7d180f0e4)]
 interface nsIAccessibleRole : nsISupports
 {
   /**
@@ -392,7 +392,8 @@ interface nsIAccessibleRole : nsISupports
   const unsigned long ROLE_ANIMATION = 54;
 
   /**
-   * Represents a mathematical equation. It is used by MATHML.
+   * Represents a mathematical equation. It is used by MATHML, where there is a
+   * rich DOM subtree for an equation. Use ROLE_FLAT_EQUATION for <img role="math" alt="[TeX]"/>
    */
   const unsigned long ROLE_EQUATION = 55;
 
@@ -763,10 +764,15 @@ interface nsIAccessibleRole : nsISupports
    */
   const unsigned long ROLE_LISTBOX = 119;
 
+  /**
+   * Represents a mathematical equation in the accessible name
+   */
+  const unsigned long ROLE_FLAT_EQUATION = 120;
+  
   /**
    * It's not role actually. This contanst is important to help ensure
    * nsRoleMap's are synchronized.
    */
-  const unsigned long ROLE_LAST_ENTRY = 120;
+  const unsigned long ROLE_LAST_ENTRY = 121;
 };
 
diff --git a/accessible/src/atk/nsRoleMap.h b/accessible/src/atk/nsRoleMap.h
index bdcf2138605..337f9182aa4 100644
--- a/accessible/src/atk/nsRoleMap.h
+++ b/accessible/src/atk/nsRoleMap.h
@@ -166,6 +166,7 @@ static const PRUint32 atkRoleMap[] = {
     ATK_ROLE_LIST_ITEM,           // nsIAccessibleRole::ROLE_OPTION               117
     ATK_ROLE_LIST_ITEM,           // nsIAccessibleRole::ROLE_RICH_OPTION          118
     ATK_ROLE_LIST,                // nsIAccessibleRole::ROLE_LISTBOX              119
+    ATK_ROLE_UNKNOWN,             // nsIAccessibleRole::ROLE_FLAT_EQUATION        120
     kROLE_ATK_LAST_ENTRY          // nsIAccessibleRole::ROLE_LAST_ENTRY
 };
 
diff --git a/accessible/src/base/nsARIAMap.cpp b/accessible/src/base/nsARIAMap.cpp
index b12e25ac644..25c669433d4 100644
--- a/accessible/src/base/nsARIAMap.cpp
+++ b/accessible/src/base/nsARIAMap.cpp
@@ -107,6 +107,7 @@ nsRoleMapEntry nsARIAMap::gWAIRoleMap[] =
             {&nsAccessibilityAtoms::aria_checked, kBoolState, nsIAccessibleStates::STATE_CHECKED | nsIAccessibleStates::STATE_CHECKABLE},
             {&nsAccessibilityAtoms::aria_checked, "mixed", nsIAccessibleStates::STATE_MIXED | nsIAccessibleStates::STATE_CHECKABLE},
             {&nsAccessibilityAtoms::aria_checked, "false", nsIAccessibleStates::STATE_CHECKABLE}, kEndEntry},
+  {"math", nsIAccessibleRole::ROLE_FLAT_EQUATION, eNameLabelOrTitle, eNoValue, kNoReqStates, kEndEntry},
   {"menu", nsIAccessibleRole::ROLE_MENUPOPUP, eNameLabelOrTitle, eNoValue, kNoReqStates, kEndEntry},
   {"menubar", nsIAccessibleRole::ROLE_MENUBAR, eNameLabelOrTitle, eNoValue, kNoReqStates, kEndEntry},
   {"menuitem", nsIAccessibleRole::ROLE_MENUITEM, eNameOkFromChildren, eNoValue, kNoReqStates,
diff --git a/accessible/src/base/nsAccessibilityService.h b/accessible/src/base/nsAccessibilityService.h
index 55ebe0d12aa..59f3bca6f82 100644
--- a/accessible/src/base/nsAccessibilityService.h
+++ b/accessible/src/base/nsAccessibilityService.h
@@ -269,8 +269,8 @@ static const char kRoleNames[][20] = {
   "image map",           //ROLE_IMAGE_MAP
   "listbox option",      //ROLE_OPTION
   "listbox rich option", //ROLE_RICH_OPTION
-  "listbox"              //ROLE_LISTBOX
-  
+  "listbox",             //ROLE_LISTBOX
+  "flat equation"        //ROLE_FLAT_EQUATION  
 };
 
 /**
diff --git a/accessible/src/base/nsAccessible.cpp b/accessible/src/base/nsAccessible.cpp
index d67fa9951d1..65a70481019 100644
--- a/accessible/src/base/nsAccessible.cpp
+++ b/accessible/src/base/nsAccessible.cpp
@@ -3523,6 +3523,7 @@ PRBool nsAccessible::MustPrune(nsIAccessible *aAccessible)
          role == nsIAccessibleRole::ROLE_COMBOBOX_OPTION ||
          role == nsIAccessibleRole::ROLE_OPTION ||
          role == nsIAccessibleRole::ROLE_ENTRY ||
+         role == nsIAccessibleRole::ROLE_FLAT_EQUATION ||
          role == nsIAccessibleRole::ROLE_PASSWORD_TEXT ||
          role == nsIAccessibleRole::ROLE_PUSHBUTTON ||
          role == nsIAccessibleRole::ROLE_TOGGLE_BUTTON ||
diff --git a/accessible/src/mac/nsRoleMap.h b/accessible/src/mac/nsRoleMap.h
index 2802537c9ae..d4ea3818f14 100644
--- a/accessible/src/mac/nsRoleMap.h
+++ b/accessible/src/mac/nsRoleMap.h
@@ -162,5 +162,6 @@ static const NSString* AXRoles [] = {
   NSAccessibilityRowRole,                       // ROLE_OPTION
   NSAccessibilityRowRole,                       // ROLE_RICH_OPTION
   NSAccessibilityListRole,                      // ROLE_LISTBOX
+  NSAccessibilityUnknownRole,                   // ROLE_FLAT_EQUATION
   @"ROLE_LAST_ENTRY"                            // ROLE_LAST_ENTRY. bogus role that will never be shown (just marks the end of this array)!
 };
diff --git a/accessible/src/msaa/nsRoleMap.h b/accessible/src/msaa/nsRoleMap.h
index 516f72fc300..946df5e1f39 100644
--- a/accessible/src/msaa/nsRoleMap.h
+++ b/accessible/src/msaa/nsRoleMap.h
@@ -434,6 +434,9 @@ static const WindowsRoleMapItem gWindowsRoleMap[] = {
   // nsIAccessibleRole::ROLE_LISTBOX
   { ROLE_SYSTEM_LIST, ROLE_SYSTEM_LIST },
   
+  // nsIAccessibleRole::ROLE_FLAT_EQUATION
+  { ROLE_SYSTEM_EQUATION, ROLE_SYSTEM_EQUATION },
+  
   // nsIAccessibleRole::ROLE_LAST_ENTRY
   { ROLE_WINDOWS_LAST_ENTRY, ROLE_WINDOWS_LAST_ENTRY }
 };