Examine source code of Blue Dark

{
  "name": "Blue Dark",
  "manifest_version": 2,
  "version": "2.1resigned1",
  "theme": {
    "images": {
      "theme_frame": "Unbenannt-1.png"
    },
    "colors": {
      "frame": "rgba(19, 18, 22, 1)",
      "tab_background_text": "rgba(212, 210, 210, 1)",
      "toolbar": "rgba(17, 61, 128, 1)",
      "bookmark_text": "rgba(19, 18, 22, 1)",
      "toolbar_field": "rgba(19, 18, 22, 1)",
      "toolbar_field_text": "rgba(212, 210, 210, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ee7be6e9-bb72-4eb2-91ca-a5b8d202070e}"
    }
  }
}