Examine source code of Shameimaru Touhou

{
  "theme": {
    "images": {
      "theme_frame": "MOZILLATOUHOUPERSONAHEADERAYASHAMEIMARU.jpg"
    },
    "colors": {
      "frame": "#ff0000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Shameimaru Touhou",
  "manifest_version": 2,
  "description": "my first one. Maybe some people will like it."
}