When the new menus are enabled by default and officially released (aiming for Fx 129), the duplicate code for the old Type controls menu and Read aloud menu can be removed from the code-base. This involves going through aboutReader.html, aboutReader.css, NarrateControls.sys.mjs, and VoiceSelect.sys.mjs and removing the code that is executed conditionally only when the reader.improved_text_menu.enabled and reader.colors_menu.enabled prefs are false. We may also want to rename HTML classes and function names so they no longer have the "improved" prefix. aboutReader.ftl and narrate.properties also contain some strings that are no longer used.