Examine source code of pastel

{
  "name": "pastel",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "InShot_20221118_232258293.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(224, 211, 211, 1)",
      "bookmark_text": "rgba(96, 108, 133, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(88, 87, 99, 1)",
      "tab_line": "rgba(117, 99, 199, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e90cc730-b3ef-4823-98dc-bea388247da1}"
    }
  }
}