Examine source code of Billie Eilish :3

{
  "name": "billie eilish",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Billie Eilish 11.jpg"
    },
    "colors": {
      "frame": "rgba(159, 204, 186, 1)",
      "tab_background_text": "rgba(224, 208, 208, 1)",
      "toolbar": "rgba(40, 240, 240, 0.26)",
      "bookmark_text": "rgba(240, 201, 201, 1)",
      "toolbar_field": "rgba(204, 204, 204, 1)",
      "toolbar_field_text": "rgba(107, 143, 80, 1)"
    }
  }
}