Examine source code of My light gray

{
  "name": "My light gray",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "2022-04-05 182401.png"
    },
    "colors": {
      "frame": "rgba(214, 214, 214, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(235, 239, 240, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6721de0d-3e53-4d2a-a02e-519d1fc8e380}"
    }
  }
}