Examine source code of SUPER JUNIOR D&E

{
  "name": "SUPER JUNIOR D&E",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "1600875046-image 2.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 245, 245, 1)",
      "toolbar": "rgba(33, 15, 15, 0.31)",
      "bookmark_text": "rgba(255, 255, 255, 0.81)",
      "toolbar_field": "rgba(56, 37, 37, 0.43)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  }
}