Examine source code of Ahhh...Spring

{
  "theme": {
    "images": {
      "theme_frame": "firefoxpersona-cherryblossom2.jpg"
    },
    "colors": {
      "frame": "#fc8ac1",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Ahhh...Spring",
  "manifest_version": 2,
  "description": "A lovely spring time persona that will get rid of your winter blues in no time! :)"
}