--- a/editor/ui/chrome/composer/editor.properties
+++ b/editor/ui/chrome/composer/editor.properties
@@ -107,16 +107,17 @@ Style_A=A, B, C…
 Style_a=a, b, c…
 Pixels=pixels
 Percent=percent
 PercentOfCell=% of cell
 PercentOfWindow=% of window
 PercentOfTable=% of table
 #LOCALIZATION NOTE (untitledTitle): %S is the window #.  No plural handling needed.
 untitledTitle=untitled-%S
+untitledDefaultFilename=untitled
 ShowToolbar=Show Toolbar
 HideToolbar=Hide Toolbar
 ImapError=Unable to load image 
 ImapCheck=\nPlease select a new location (URL) and try again.
 SaveToUseRelativeUrl=Relative URLs can only be used on pages which have been saved
 NoNamedAnchorsOrHeadings=(No named anchors or headings in this page)
 TextColor=Text Colour
 HighlightColor=Highlight Colour