Examine source code of Void Nebula

{
  "name": "Void Nebula",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "align-center.svg"
    },
    "colors": {
      "frame": "rgba(30, 30, 40, 1)",
      "tab_background_text": "rgba(240, 240, 240, 1)",
      "toolbar": "rgba(50, 50, 67, 1)",
      "bookmark_text": "rgba(240, 240, 240, 1)",
      "toolbar_field": "rgba(30, 30, 40, 1)",
      "toolbar_field_text": "rgba(240, 240, 240, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{19c865c3-daa1-4312-aea0-ff9b37ad3ca6}"
    }
  }
}