Examine source code of FizTheme

{
  "name": "FizTheme",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot_2022-06-18_000.png"
    },
    "colors": {
      "frame": "rgba(15, 20, 23, 1)",
      "tab_background_text": "rgba(189, 195, 194, 1)",
      "toolbar": "rgba(43, 49, 54, 1)",
      "bookmark_text": "rgba(189, 195, 194, 1)",
      "toolbar_field": "rgba(15, 20, 23, 0.7)",
      "toolbar_field_text": "rgba(189, 195, 194, 1)",
      "tab_line": "rgba(15, 20, 23, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{464d5d08-f41c-416d-b559-56ef14199f18}"
    }
  }
}