Examine source code of Soft Dark Mode

{
  "name": "Soft Dark Mode",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Soft Dark Mode logo.png"
    },
    "colors": {
      "frame": "rgba(38, 38, 38, 1)",
      "tab_background_text": "rgba(148, 148, 148, 1)",
      "toolbar": "rgba(61, 61, 61, 1)",
      "bookmark_text": "rgba(107, 107, 107, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(82, 82, 82, 1)"
    }
  }
}