Examine source code of dark mode but blue

{
  "name": "dark mode but blue",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "20220412_192148.jpeg"
    },
    "colors": {
      "frame": "rgba(68, 97, 133, 1)",
      "tab_background_text": "rgba(115, 161, 217, 1)",
      "toolbar": "rgba(6, 17, 31, 1)",
      "bookmark_text": "rgba(229, 241, 255, 1)",
      "toolbar_field": "rgba(209, 230, 255, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(161, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e41a2994-bed3-4a48-b0be-3003d9b4a404}"
    }
  }
}