Examine source code of Material Theme

{
  "name": "Material Theme",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2022-11-22 231130.png"
    },
    "colors": {
      "frame": "rgba(38, 50, 56, 1)",
      "tab_background_text": "rgba(238, 255, 255, 1)",
      "toolbar": "rgba(25, 34, 39, 1)",
      "bookmark_text": "rgba(238, 255, 255, 1)",
      "toolbar_field": "rgba(38, 50, 56, 1)",
      "toolbar_field_text": "rgba(238, 255, 255, 1)",
      "tab_line": "rgba(25, 34, 39, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5a8e7ead-7a20-4219-9a00-5ed0f345674e}"
    }
  }
}