Examine source code of blackbluegray

{
  "name": "blackblue",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "mitchell-luo-FWoq_ldWlNQ-unsplash.jpg"
    },
    "colors": {
      "frame": "rgba(49, 50, 51, 1)",
      "tab_background_text": "rgba(54, 172, 199, 1)",
      "toolbar": "rgba(12, 27, 56, 1)",
      "bookmark_text": "rgba(152, 155, 161, 1)",
      "toolbar_field": "rgba(48, 49, 51, 1)",
      "toolbar_field_text": "rgba(34, 140, 186, 1)",
      "tab_line": "rgba(45, 145, 207, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{94851be7-d6f6-4f2f-9c23-d6029977ff5a}"
    }
  }
}