diff --git a/accessible/interfaces/nsIAccessibilityService.idl b/accessible/interfaces/nsIAccessibilityService.idl
index ff145c877e37..87a77f7e52d1 100644
--- a/accessible/interfaces/nsIAccessibilityService.idl
+++ b/accessible/interfaces/nsIAccessibilityService.idl
@@ -78,6 +78,15 @@ interface nsIAccessibilityService : nsISupports
    */
   nsIAccessible getAccessibleFromCache(in Node aNode);
 
+  /**
+   * Set the active cache domains. If any given domains are not currently
+   * active, then the accessibility service will enable them in all content
+   * processes, causing them to be cached.
+   *
+   * @param aCacheDomains [in] the cache domains to set
+   */
+  void setCacheDomains(in unsigned long long aCacheDomains);
+
   /**
    * Create a new pivot for tracking a position and traversing a subtree.
    *
diff --git a/accessible/xpcom/xpcAccessibilityService.cpp b/accessible/xpcom/xpcAccessibilityService.cpp
index f6692bffbb02..c6fd0c15d293 100644
--- a/accessible/xpcom/xpcAccessibilityService.cpp
+++ b/accessible/xpcom/xpcAccessibilityService.cpp
@@ -229,6 +229,17 @@ xpcAccessibilityService::GetAccessibleFromCache(nsINode* aNode,
   return NS_OK;
 }
 
+NS_IMETHODIMP
+xpcAccessibilityService::SetCacheDomains(uint64_t aCacheDomains) {
+  nsAccessibilityService* accService = GetAccService();
+  if (!accService) {
+    return NS_ERROR_SERVICE_NOT_AVAILABLE;
+  }
+
+  accService->SetCacheDomains(aCacheDomains);
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 xpcAccessibilityService::CreateAccessiblePivot(nsIAccessible* aRoot,
                                                nsIAccessiblePivot** aPivot) {