diff --git a/content/base/public/nsIDocument.h b/content/base/public/nsIDocument.h
index f958decaf80a..be7dfe9e2ad0 100644
--- a/content/base/public/nsIDocument.h
+++ b/content/base/public/nsIDocument.h
@@ -191,6 +191,11 @@ public:
    */
   virtual void SelectAll() = 0;
 
+  /**
+    * Finds text in content
+   */
+  NS_IMETHOD FindNext(const nsString &aSearchStr, PRBool aMatchCase, PRBool aSearchDown, PRBool &aIsFound) = 0;
+
   /**
     * Copies all text from the selection
    */
diff --git a/layout/base/public/nsIDocument.h b/layout/base/public/nsIDocument.h
index f958decaf80a..be7dfe9e2ad0 100644
--- a/layout/base/public/nsIDocument.h
+++ b/layout/base/public/nsIDocument.h
@@ -191,6 +191,11 @@ public:
    */
   virtual void SelectAll() = 0;
 
+  /**
+    * Finds text in content
+   */
+  NS_IMETHOD FindNext(const nsString &aSearchStr, PRBool aMatchCase, PRBool aSearchDown, PRBool &aIsFound) = 0;
+
   /**
     * Copies all text from the selection
    */