Examine source code of The Eyes of the Oni

{
  "name": "The Eyes of the Oni",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "oni eyes.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7a5d33be-dbe0-408e-963d-ec3bca31d0c0}"
    }
  }
}