diff --git a/accessible/public/nsIAccessibleProvider.idl b/accessible/public/nsIAccessibleProvider.idl
index eb3137fb86cd..9e2614b5dd65 100644
--- a/accessible/public/nsIAccessibleProvider.idl
+++ b/accessible/public/nsIAccessibleProvider.idl
@@ -108,48 +108,55 @@ interface nsIAccessibleProvider : nsISupports
    * Constants set is used by XForms elements.
    */
 
-   /** Used for xforms elements that provide accessible object for itself as
-    * well for anonymous content. This property are used for upload,
-    * input[type="xsd:gDay"] and input[type="xsd:gMonth"] */
-   const long XFormsContainer = 0x00002000;
+  /** Used for xforms elements that provide accessible object for itself as
+   * well for anonymous content. This property are used for upload,
+   * input[type="xsd:gDay"] and input[type="xsd:gMonth"] */
+  const long XFormsContainer = 0x00002000;
 
-   /** Used for label element */
-   const long XFormsLabel = 0x00002001;
-   /** Used for output element */
-   const long XFormsOuput = 0x00002002;
-   /** Used for trigger and submit elements */
-   const long XFormsTrigger = 0x00002003;
-   /** Used for input and textarea elements */
-   const long XFormsInput = 0x00002004;
-   /** Used for input[xsd:boolean] element */
-   const long XFormsInputBoolean = 0x00002005;
-   /** Used for input[xsd:date] element */
-   const long XFormsInputDate = 0x00002006;
-   /** Used for secret element */
-   const long XFormsSecret = 0x00002007;
-   /** Used for range element represented by slider */
-   const long XFormsSliderRange = 0x00002008;
+  /** Used for label element */
+  const long XFormsLabel = 0x00002001;
+  /** Used for output element */
+  const long XFormsOuput = 0x00002002;
+  /** Used for trigger and submit elements */
+  const long XFormsTrigger = 0x00002003;
+  /** Used for input and textarea elements */
+  const long XFormsInput = 0x00002004;
+  /** Used for input[xsd:boolean] element */
+  const long XFormsInputBoolean = 0x00002005;
+  /** Used for input[xsd:date] element */
+  const long XFormsInputDate = 0x00002006;
+  /** Used for secret element */
+  const long XFormsSecret = 0x00002007;
+  /** Used for range element represented by slider */
+  const long XFormsSliderRange = 0x00002008;
 
-   /** Used for select and select1 that are implemented using host document's
-    * native widget. For example, a select1 in a xhtml document may be
-    * represented by the native html control html:select */
-   const long XFormsSelect = 0x00002009;
-   /** Used for xforms choices element */
-   const long XFormsChoices = 0x00002010;
-   /** Used for xforms full select/select1 elements that may be represented by
-    * group of checkboxes and radiogroup */
-   const long XFormsSelectFull = 0x00002011;
-   /** Used for xforms item element that is used inside xforms select elements
-    * represented by group of checkboxes */
-   const long XFormsItemCheckgroup = 0x00002012;
-   /** Used for xforms item element that is used inside xforms select1 elements
-    * represented by radio group */
-   const long XFormsItemRadiogroup = 0x00002013;
+  /** Used for select and select1 that are implemented using host document's
+   * native widget. For example, a select1 in a xhtml document may be
+   * represented by the native html control html:select */
+  const long XFormsSelect = 0x00002009;
+  /** Used for xforms choices element */
+  const long XFormsChoices = 0x00002010;
+  /** Used for xforms full select/select1 elements that may be represented by
+   * group of checkboxes and radiogroup */
+  const long XFormsSelectFull = 0x00002011;
+  /** Used for xforms item element that is used inside xforms select elements
+   * represented by group of checkboxes */
+  const long XFormsItemCheckgroup = 0x00002012;
+  /** Used for xforms item element that is used inside xforms select1 elements
+   * represented by radio group */
+  const long XFormsItemRadiogroup = 0x00002013;
+  /** Used for xforms select1 element that is represented by combobox */
+  const long XFormsSelectCombobox = 0x00002014;
+  /** Used for xforms item element that is used inside xforms select1
+   * elements represented by combobox */
+  const long XFormsItemCombobox = 0x00002015;
 
-   /** Used for dropmarker widget that is used by xforms elements */
-   const long XFormsDropmarkerWidget = 0x00002101;
-   /** Used for calendar widget that is used by xforms elements */
-   const long XFormsCalendarWidget = 0x00002102;
+  /** Used for dropmarker widget that is used by xforms elements */
+  const long XFormsDropmarkerWidget = 0x00002101;
+  /** Used for calendar widget that is used by xforms elements */
+  const long XFormsCalendarWidget = 0x00002102;
+  /** Used for popup widget that is used by xforms minimal select1 elements */
+  const long XFormsComboboxPopupWidget = 0x00002103;
 
   /**
    * Return one of constants declared above.
diff --git a/accessible/src/base/nsAccessibilityService.cpp b/accessible/src/base/nsAccessibilityService.cpp
index 8f6a68a0d865..2d58263ea690 100644
--- a/accessible/src/base/nsAccessibilityService.cpp
+++ b/accessible/src/base/nsAccessibilityService.cpp
@@ -1587,6 +1587,12 @@ nsresult nsAccessibilityService::GetAccessibleByType(nsIDOMNode *aNode,
     case nsIAccessibleProvider::XFormsItemRadiogroup:
       *aAccessible = new nsXFormsItemRadiogroupAccessible(aNode, weakShell);
       break;
+    case nsIAccessibleProvider::XFormsSelectCombobox:
+      *aAccessible = new nsXFormsSelectComboboxAccessible(aNode, weakShell);
+      break;
+    case nsIAccessibleProvider::XFormsItemCombobox:
+      *aAccessible = new nsXFormsItemComboboxAccessible(aNode, weakShell);
+      break;
 
     case nsIAccessibleProvider::XFormsDropmarkerWidget:
       *aAccessible = new nsXFormsDropmarkerWidgetAccessible(aNode, weakShell);
@@ -1594,6 +1600,9 @@ nsresult nsAccessibilityService::GetAccessibleByType(nsIDOMNode *aNode,
     case nsIAccessibleProvider::XFormsCalendarWidget:
       *aAccessible = new nsXFormsCalendarWidgetAccessible(aNode, weakShell);
       break;
+    case nsIAccessibleProvider::XFormsComboboxPopupWidget:
+      *aAccessible = new nsXFormsComboboxPopupWidgetAccessible(aNode, weakShell);
+      break;
 #endif
 
     default:
diff --git a/accessible/src/xforms/nsXFormsAccessible.cpp b/accessible/src/xforms/nsXFormsAccessible.cpp
index faed67274215..8c88cbd6aa1c 100755
--- a/accessible/src/xforms/nsXFormsAccessible.cpp
+++ b/accessible/src/xforms/nsXFormsAccessible.cpp
@@ -102,7 +102,7 @@ nsXFormsAccessible::GetBoundChildElementValue(const nsAString& aTagName,
 }
 
 void
-nsXFormsAccessible::CacheSelectChildren()
+nsXFormsAccessible::CacheSelectChildren(nsIDOMNode *aContainerNode)
 {
   if (!mWeakShell) {
     // This node has been shut down
@@ -117,8 +117,13 @@ nsXFormsAccessible::CacheSelectChildren()
   if (!accService)
     return;
 
+  nsCOMPtr<nsIDOMNode> container(aContainerNode);
+  if (!container)
+    container = mDOMNode;
+
   nsCOMPtr<nsIDOMNodeList> children;
-  sXFormsService->GetSelectChildrenFor(mDOMNode, getter_AddRefs(children));
+  sXFormsService->GetSelectChildrenFor(container, getter_AddRefs(children));
+
   if (!children)
     return;
 
diff --git a/accessible/src/xforms/nsXFormsAccessible.h b/accessible/src/xforms/nsXFormsAccessible.h
index 879ed8e9e79d..d07218758aa6 100755
--- a/accessible/src/xforms/nsXFormsAccessible.h
+++ b/accessible/src/xforms/nsXFormsAccessible.h
@@ -100,7 +100,9 @@ protected:
   // element. Note, those select/select1 elements that use native widget
   // for representation don't use the method since their item/choices elements
   // are hidden and therefore aren't accessible.
-  void CacheSelectChildren();
+  //
+  // @param aContainerNode - node that contains item elements
+  void CacheSelectChildren(nsIDOMNode *aContainerNode = nsnull);
 };
 
 
diff --git a/accessible/src/xforms/nsXFormsFormControlsAccessible.cpp b/accessible/src/xforms/nsXFormsFormControlsAccessible.cpp
index bb17702ab0a6..18cdc369a7c4 100755
--- a/accessible/src/xforms/nsXFormsFormControlsAccessible.cpp
+++ b/accessible/src/xforms/nsXFormsFormControlsAccessible.cpp
@@ -562,3 +562,93 @@ nsXFormsItemRadiogroupAccessible::GetActionName(PRUint8 aIndex, nsAString& aName
   return NS_OK;
 }
 
+
+// nsXFormsSelectComboboxAccessible
+
+nsXFormsSelectComboboxAccessible::
+  nsXFormsSelectComboboxAccessible(nsIDOMNode *aNode, nsIWeakReference *aShell):
+  nsXFormsSelectableAccessible(aNode, aShell)
+{
+}
+
+NS_IMETHODIMP
+nsXFormsSelectComboboxAccessible::GetRole(PRUint32 *aRole)
+{
+  NS_ENSURE_ARG_POINTER(aRole);
+
+  *aRole = ROLE_COMBOBOX;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXFormsSelectComboboxAccessible::GetState(PRUint32 *aState)
+{
+  nsresult rv = nsXFormsSelectableAccessible::GetState(aState);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  PRBool isOpen = PR_FALSE;
+  rv = sXFormsService->IsDropmarkerOpen(mDOMNode, &isOpen);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (isOpen)
+    *aState = STATE_EXPANDED;
+  else
+    *aState = STATE_COLLAPSED;
+
+  *aState |= STATE_HASPOPUP | STATE_FOCUSABLE;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXFormsSelectComboboxAccessible::GetAllowsAnonChildAccessibles(PRBool *aAllowsAnonChildren)
+{
+  NS_ENSURE_ARG_POINTER(aAllowsAnonChildren);
+
+  *aAllowsAnonChildren = PR_TRUE;
+  return NS_OK;
+}
+
+
+// nsXFormsItemComboboxAccessible
+
+nsXFormsItemComboboxAccessible::
+  nsXFormsItemComboboxAccessible(nsIDOMNode *aNode, nsIWeakReference *aShell):
+  nsXFormsSelectableItemAccessible(aNode, aShell)
+{
+}
+
+NS_IMETHODIMP
+nsXFormsItemComboboxAccessible::GetRole(PRUint32 *aRole)
+{
+  NS_ENSURE_ARG_POINTER(aRole);
+
+  *aRole = ROLE_LISTITEM;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXFormsItemComboboxAccessible::GetState(PRUint32 *aState)
+{
+  nsresult rv = nsXFormsSelectableItemAccessible::GetState(aState);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (*aState & STATE_UNAVAILABLE)
+    return NS_OK;
+
+  *aState |= STATE_SELECTABLE;
+  if (IsItemSelected())
+    *aState |= STATE_SELECTED;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXFormsItemComboboxAccessible::GetActionName(PRUint8 aIndex, nsAString& aName)
+{
+  if (aIndex != eAction_Click)
+    return NS_ERROR_INVALID_ARG;
+
+  nsAccessible::GetTranslatedString(NS_LITERAL_STRING("select"), aName);
+  return NS_OK;
+}
+
diff --git a/accessible/src/xforms/nsXFormsFormControlsAccessible.h b/accessible/src/xforms/nsXFormsFormControlsAccessible.h
index ede6cdfce247..be07396f3bfc 100755
--- a/accessible/src/xforms/nsXFormsFormControlsAccessible.h
+++ b/accessible/src/xforms/nsXFormsFormControlsAccessible.h
@@ -241,5 +241,41 @@ public:
   NS_IMETHOD GetActionName(PRUint8 aIndex, nsAString& aName);
 };
 
+
+/**
+ * Accessible object for xforms:select1 of minimal appearance that is
+ * represented by combobox.
+ */
+
+class nsXFormsSelectComboboxAccessible : public nsXFormsSelectableAccessible
+{
+public:
+  nsXFormsSelectComboboxAccessible(nsIDOMNode* aNode, nsIWeakReference* aShell);
+
+  NS_IMETHOD GetRole(PRUint32 *aRole);
+  NS_IMETHOD GetState(PRUint32 *aState);
+
+  // Allows accessible nodes in anonymous content of xforms element by
+  // always returning PR_TRUE value.
+  NS_IMETHOD GetAllowsAnonChildAccessibles(PRBool *aAllowsAnonChildren);
+};
+
+
+/**
+ * Accessible object for xforms:item element when it is represented by a
+ * listitem. This occurs when the item is contained in a xforms:select with
+ * minimal appearance. Such a xforms:select is represented by a combobox.
+ */
+
+class nsXFormsItemComboboxAccessible : public nsXFormsSelectableItemAccessible
+{
+public:
+  nsXFormsItemComboboxAccessible(nsIDOMNode* aNode, nsIWeakReference* aShell);
+
+  NS_IMETHOD GetRole(PRUint32 *aRole);
+  NS_IMETHOD GetState(PRUint32 *aState);
+  NS_IMETHOD GetActionName(PRUint8 aIndex, nsAString& aName);
+};
+
 #endif
 
diff --git a/accessible/src/xforms/nsXFormsWidgetsAccessible.cpp b/accessible/src/xforms/nsXFormsWidgetsAccessible.cpp
index 0d82f30b6436..7d5bab88004b 100644
--- a/accessible/src/xforms/nsXFormsWidgetsAccessible.cpp
+++ b/accessible/src/xforms/nsXFormsWidgetsAccessible.cpp
@@ -127,3 +127,73 @@ nsXFormsCalendarWidgetAccessible::GetRole(PRUint32 *aRole)
   return NS_OK;
 }
 
+
+// nsXFormsComboboxPopupWidgetAccessible
+
+nsXFormsComboboxPopupWidgetAccessible::
+  nsXFormsComboboxPopupWidgetAccessible(nsIDOMNode *aNode, nsIWeakReference *aShell):
+  nsXFormsAccessible(aNode, aShell)
+{
+}
+
+NS_IMETHODIMP
+nsXFormsComboboxPopupWidgetAccessible::GetRole(PRUint32 *aRole)
+{
+  NS_ENSURE_ARG_POINTER(aRole);
+
+  *aRole = ROLE_LIST;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXFormsComboboxPopupWidgetAccessible::GetState(PRUint32 *aState)
+{
+  NS_ENSURE_ARG_POINTER(aState);
+
+  nsXFormsAccessible::GetState(aState);
+
+  PRBool isOpen = PR_FALSE;
+  nsresult rv = sXFormsService->IsDropmarkerOpen(mDOMNode, &isOpen);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aState |= STATE_FOCUSABLE;
+
+  if (isOpen)
+    *aState = STATE_FLOATING;
+  else
+    *aState = STATE_INVISIBLE;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXFormsComboboxPopupWidgetAccessible::GetValue(nsAString& aValue)
+{
+  aValue.Truncate();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXFormsComboboxPopupWidgetAccessible::GetName(nsAString& aName)
+{
+  aName.Truncate();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsXFormsComboboxPopupWidgetAccessible::GetDescription(nsAString& aDescription)
+{
+  aDescription.Truncate();
+  return NS_OK;
+}
+
+void
+nsXFormsComboboxPopupWidgetAccessible::CacheChildren()
+{
+  nsCOMPtr<nsIDOMNode> parent;
+  mDOMNode->GetParentNode(getter_AddRefs(parent));
+
+  // Parent node must be an xforms:select1 element.
+  CacheSelectChildren(parent);
+}
+
diff --git a/accessible/src/xforms/nsXFormsWidgetsAccessible.h b/accessible/src/xforms/nsXFormsWidgetsAccessible.h
index 61ca0619b103..2cc360c65961 100644
--- a/accessible/src/xforms/nsXFormsWidgetsAccessible.h
+++ b/accessible/src/xforms/nsXFormsWidgetsAccessible.h
@@ -74,4 +74,24 @@ public:
   NS_IMETHOD GetRole(PRUint32 *aRole);
 };
 
+
+/**
+ * Accessible object for popup menu of minimal xforms select1 element that is
+ * represented by combobox.
+ */
+class nsXFormsComboboxPopupWidgetAccessible : public nsXFormsAccessible
+{
+public:
+  nsXFormsComboboxPopupWidgetAccessible(nsIDOMNode *aNode,
+                                        nsIWeakReference *aShell);
+
+  NS_IMETHOD GetRole(PRUint32 *aRole);
+  NS_IMETHOD GetState(PRUint32 *aState);
+  NS_IMETHOD GetValue(nsAString& aValue);
+  NS_IMETHOD GetName(nsAString& aName);
+  NS_IMETHOD GetDescription(nsAString& aDescription);
+
+  void CacheChildren();
+};
+
 #endif
diff --git a/content/base/public/nsIXFormsUtilityService.h b/content/base/public/nsIXFormsUtilityService.h
index 92c2a79c5658..71b16e344d89 100755
--- a/content/base/public/nsIXFormsUtilityService.h
+++ b/content/base/public/nsIXFormsUtilityService.h
@@ -136,15 +136,16 @@ public:
   NS_IMETHOD GetEditor(nsIDOMNode *aElement, nsIEditor **aEditor) = 0;
 
   /**
-   * Return true if dropmarker is in open state, otherwise false. Failure if
-   * given element is not dropmarker or its parent element isn't supposed to
-   * have dropmarker.
+   * Return true if dropmarker is in open state (combobox popup is open),
+   * otherwise false. Failure if given 'aElement' node is not direct child of
+   * combobox element or is not combobox itself.
    */
   NS_IMETHOD IsDropmarkerOpen(nsIDOMNode *aElement, PRBool* aIsOpen) = 0;
 
   /**
-   * Toggles dropmarker state. Failure if given element is not dropmarker or
-   * its parent element isn't supposed to have dropmarker.
+   * Toggles dropmarker state (close/open combobox popup). Failure if given
+   * 'aElement' node is not direct child of combobox element or is not combobox
+   * itself.
    */
   NS_IMETHOD ToggleDropmarkerState(nsIDOMNode *aElement) = 0;
 
diff --git a/extensions/xforms/nsXFormsItemElement.cpp b/extensions/xforms/nsXFormsItemElement.cpp
index 59e69ca079c5..f658f63632a6 100644
--- a/extensions/xforms/nsXFormsItemElement.cpp
+++ b/extensions/xforms/nsXFormsItemElement.cpp
@@ -42,6 +42,9 @@
 #include "nsXFormsAtoms.h"
 #include "nsIDOMNodeList.h"
 #include "nsIDOMDocument.h"
+#include "nsIDOMDocumentEvent.h"
+#include "nsIDOMEvent.h"
+#include "nsIPrivateDOMEvent.h"
 #include "nsString.h"
 #include "nsXFormsUtils.h"
 #include "nsIXFormsValueElement.h"
@@ -397,6 +400,33 @@ nsXFormsItemElement::SetActive(PRBool aActive)
 {
   /// @see comment in nsIXFormsItemElement.idl
 
+  if (aActive) {
+    // Fire 'DOMMenuItemActive' event. This event is used by accessible module.
+    nsCOMPtr<nsIDOMDocument> domDoc;
+    mElement->GetOwnerDocument(getter_AddRefs(domDoc));
+    nsCOMPtr<nsIDOMDocumentEvent> doc = do_QueryInterface(domDoc);
+    NS_ENSURE_STATE(doc);
+
+    nsCOMPtr<nsIDOMEvent> event;
+    doc->CreateEvent(NS_LITERAL_STRING("Events"), getter_AddRefs(event));
+    NS_ENSURE_TRUE(event, NS_ERROR_OUT_OF_MEMORY);
+
+    event->InitEvent(NS_LITERAL_STRING("DOMMenuItemActive"),
+                     PR_TRUE, PR_TRUE);
+
+    nsCOMPtr<nsIDOMNode> node(do_QueryInterface(mElement));
+    NS_ENSURE_STATE(node);
+
+    nsXFormsUtils::SetEventTrusted(event, node);
+
+    nsCOMPtr<nsIDOMEventTarget> target(do_QueryInterface(mElement));
+    NS_ENSURE_STATE(target);
+
+    PRBool defaultActionEnabled = PR_TRUE;
+    nsresult rv = target->DispatchEvent(event, &defaultActionEnabled);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
   NS_NAMED_LITERAL_STRING(active, "_moz_active");
 
   return aActive ?
diff --git a/extensions/xforms/nsXFormsUtilityService.cpp b/extensions/xforms/nsXFormsUtilityService.cpp
index 99cdcd049652..f663a67fa43b 100644
--- a/extensions/xforms/nsXFormsUtilityService.cpp
+++ b/extensions/xforms/nsXFormsUtilityService.cpp
@@ -72,9 +72,11 @@ NS_ENSURE_TRUE(widget, NS_ERROR_FAILURE);\
 
 #define GET_COMBOBOX_UIWIDGET \
 NS_ENSURE_ARG(aElement);\
-nsCOMPtr<nsIContent> content(do_QueryInterface(aElement));\
-nsCOMPtr<nsIContent> parent(content->GetBindingParent());\
-nsCOMPtr<nsIXFormsComboboxUIWidget> widget(do_QueryInterface(parent));\
+nsCOMPtr<nsIXFormsComboboxUIWidget> widget(do_QueryInterface(aElement));\
+if (!widget) {\
+  nsCOMPtr<nsIContent> content(do_QueryInterface(aElement));\
+  widget = do_QueryInterface(content->GetBindingParent());\
+}\
 NS_ENSURE_TRUE(widget, NS_ERROR_FAILURE);\
 
 #define GET_XFORMS_SELECT1 \
@@ -367,6 +369,8 @@ nsresult
 nsXFormsUtilityService::GetSelectChildrenForNodeInternal(nsIDOMNode *aElement,
                                                          nsNodeList *aNodeList)
 {
+  NS_ENSURE_ARG(aElement);
+
   nsCOMPtr<nsIDOMNodeList> children;
   aElement->GetChildNodes(getter_AddRefs(children));
   NS_ENSURE_TRUE(children, NS_ERROR_FAILURE);
diff --git a/extensions/xforms/resources/content/select1.xml b/extensions/xforms/resources/content/select1.xml
index 5bca6a92e19a..c53b6a57eb5c 100644
--- a/extensions/xforms/resources/content/select1.xml
+++ b/extensions/xforms/resources/content/select1.xml
@@ -52,13 +52,6 @@
     <!-- The strange indentation is because of the whitespace nodes.-->
     <content>
       <children includes="label|hint"/>
-      <html:div class="-moz-xforms-select1-popup" anonid="popup"
-                onmouseover="this.parentNode.shouldHandleBlur = false;
-                             this.parentNode.mouseOver(event);"
-                onmouseup="this.parentNode.mouseUp(event);"
-                onmouseout="this.parentNode.shouldHandleBlur = true;">
-        <children/>
-      </html:div>
       <html:span class="-moz-select1-container"
                  anonid="container"><html:input
                  class="-moz-xforms-select1-input xf-value"
@@ -77,9 +70,17 @@
                     onmouseup="this.parentNode.parentNode.shouldHandleBlur = true;"
                     onclick="this.parentNode.parentNode.togglePopup();
                              this.previousSibling.focus();"
-        /></html:span></content>
+        /></html:span>
+      <html:div mozType:comboboxpopup="true" anonid="popup"
+                onmouseover="this.parentNode.shouldHandleBlur = false;
+                             this.parentNode.mouseOver(event);"
+                onmouseup="this.parentNode.mouseUp(event);"
+                onmouseout="this.parentNode.shouldHandleBlur = true;">
+        <children/>
+      </html:div>
+    </content>
 
-    <implementation implements="nsIXFormsUIWidget, nsIXFormsNSSelect1Element, nsIXFormsNSEditableElement, nsIXFormsComboboxUIWidget">
+    <implementation implements="nsIXFormsNSSelect1Element, nsIXFormsNSEditableElement, nsIXFormsComboboxUIWidget, nsIAccessibleProvider">
 
       <!-- nsIXFormsNSEditableElement -->
       <property name="editor" readonly="true"
@@ -120,6 +121,13 @@
         </setter>
       </property>
 
+      <!-- nsIAccessibleProvider -->
+      <property name="accessibleType" readonly="true">
+        <getter>
+          return Components.interfaces.nsIAccessibleProvider.XFormsSelectCombobox;
+        </getter>
+      </property>
+
       <field name="_inputField">null</field>
       <field name="_dropMarker">null</field>
       <field name="_popup">null</field>
@@ -201,6 +209,12 @@
           if (this._selected) {
             // Remove extra white space characters from the beginning of the label.
             this.inputField.value = this._selected.labelText.replace(/^[\s\n]+/, "");
+
+            // Fire 'ValueChange' event. This event is used by accessible
+            // module.
+            var event = this.ownerDocument.createEvent("Events");
+            event.initEvent("ValueChange", false, false);
+            this.dispatchEvent(event);
           }
           ]]>
         </body>
@@ -1176,7 +1190,13 @@
       </html:div>
     </content>
 
-    <implementation>
+    <implementation implements="nsIAccessibleProvider">
+      <property name="accessibleType" readonly="true">
+        <getter>
+          return Components.interfaces.nsIAccessibleProvider.XFormsItemCombobox;
+        </getter>
+      </property>
+
       <field name="_content">null</field>
       <property name="content" readonly="true">
         <getter>
diff --git a/extensions/xforms/resources/content/widgets-xhtml.xml b/extensions/xforms/resources/content/widgets-xhtml.xml
index 9b6f96a1d746..f09e197964b0 100644
--- a/extensions/xforms/resources/content/widgets-xhtml.xml
+++ b/extensions/xforms/resources/content/widgets-xhtml.xml
@@ -755,5 +755,21 @@
     </implementation>
   </binding>
 
+
+  <!-- POPUP for MINIMAL SELECT1 -->
+  <binding id="comboboxpopup">
+    <resources>
+      <stylesheet src="chrome://xforms/skin/widgets-xhtml.css"/>
+    </resources>
+
+    <implementation implements="nsIAccessibleProvider">
+      <property name="accessibleType" readonly="true">
+        <getter>
+          return Components.interfaces.nsIAccessibleProvider.XFormsComboboxPopupWidget;
+        </getter>
+      </property>
+    </implementation>
+  </binding>
+
 </bindings>
 
diff --git a/extensions/xforms/resources/content/xforms.css b/extensions/xforms/resources/content/xforms.css
index b742cd0d4d9b..5a7ebb817e7b 100755
--- a/extensions/xforms/resources/content/xforms.css
+++ b/extensions/xforms/resources/content/xforms.css
@@ -498,6 +498,8 @@ select1 itemset, select itemset {
 }
 
   /* choices widget */
+html|*:root select1:not([appearance]) choices,
+html|*:root select1[appearance="minimal] choices,
 select[appearance='full'] choices,
 select1[appearance='full'] choices {
   -moz-binding: url('chrome://xforms/content/selects.xml#choices');
@@ -759,3 +761,7 @@ xul|*:root xul|dropmarker[mozType|dropmarker] {
   -moz-binding: url('chrome://xforms/content/widgets-xul.xml#dropmarker');
 }
 
+html|*:root html|div[mozType|comboboxpopup] {
+  -moz-binding: url('chrome://xforms/content/widgets-xhtml.xml#comboboxpopup');
+}
+
diff --git a/extensions/xforms/resources/skin/widgets-xhtml.css b/extensions/xforms/resources/skin/widgets-xhtml.css
index 634da66dbcdd..6cc0ee94e692 100644
--- a/extensions/xforms/resources/skin/widgets-xhtml.css
+++ b/extensions/xforms/resources/skin/widgets-xhtml.css
@@ -135,3 +135,22 @@ input[mozType|dropmarker]:active:hover {
   border-style: outset;
 }
 
+/* combobox popup (used inside minimal select1) */
+
+div[mozType|comboboxpopup="true"] {
+  border-width: 1px;
+  top: 0px;
+  left: 0px;
+  border: 1px outset black !important;
+  background-color: -moz-Field;
+  font: -moz-list;
+  text-align: start;
+  visibility: hidden;
+  overflow-y: auto;
+  overflow-x: hidden;
+  position: absolute;
+  -moz-user-select: none;
+  z-index: 2147482647;
+  cursor: default;
+}
+