Examine source code of obart

{
  "name": "obart",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Fire.jpg"
    },
    "colors": {
      "frame": "rgba(163, 123, 122, 1)",
      "tab_background_text": "rgba(163, 124, 122, 0.93)",
      "toolbar": "rgba(148, 100, 100, 1)",
      "bookmark_text": "rgba(242, 217, 217, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(18, 9, 9, 1)",
      "tab_line": "rgba(255, 237, 237, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8497a386-5d50-48cf-a359-81e52992355d}"
    }
  }
}