Examine source code of Modern Edge Dark Mode

{
  "name": "Modern Edge Dark Mode",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "colorrrr.png"
    },
    "colors": {
      "frame": "rgba(32, 32, 32, 1)",
      "tab_background_text": "rgba(188, 188, 188, 1)",
      "toolbar": "rgba(63, 63, 63, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(43, 43, 43, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(74, 74, 74, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3eca2ead-8b85-43c3-a619-3a983438472d}"
    }
  }
}